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Greetings ... and minimalist priming questions.

 
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flyboy(at)gmail.com
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PostPosted: Fri Feb 28, 2014 10:22 pm    Post subject: Greetings ... and minimalist priming questions. Reply with quote

Hi there. I've just started on an RV-10 and have a few questions that
searching has not yielded answers to. I know everyone loves priming
questions, but I really have tried to search for the answers first.

I've decided to only prime things that absolutely must be primed, but
I'm having trouble figuring out which things those are. I've read in
some places that "mating surfaces" must be primed. Is that all mating
surfaces? Everywhere a skin touches a rib? Or is this just mating
surfaces where one of the parts is not alclad?

Is everything that isn't alclad obviously not alclad? For instance, the
VS-1014 spar caps look different from most of the sheet metal. Is it
alclad? Does it need to be primed? Or should it be primed anyway
because it sits on top of the VS rear spar?

What about the edges of everything? Clearly there's no alclad there...
should I be worried about that? I really don't want to prime where it's
not necessary (time, weight, and the aircraft is going to be in Colorado
where nothing ever corrodes), but finding guidance for what's required
is tough.

Thanks,
Berck


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bcondrey



Joined: 03 Apr 2006
Posts: 580

PostPosted: Sat Mar 01, 2014 4:09 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

Minimal is to prime only the non-alclad aluminum.  The limits priming to parts you make from the extruded angle and stock.  Skins, ribs and the stamped out parts are all alclad.  Don't worry about the edges.  

Bob

On Saturday, March 1, 2014, Berck E. Nash <flyboy(at)gmail.com (flyboy(at)gmail.com)> wrote:
[quote] --> RV10-List message posted by: "Berck E. Nash" <[url=javascript:;]flyboy(at)gmail.com[/url]>

Hi there.  I've just started on an RV-10 and have a few questions that
searching has not yielded answers to.  I know everyone loves priming
questions, but I really have tried to search for the answers first.

I've decided to only prime things that absolutely must be primed, but
I'm having trouble figuring out which things those are.  I've read in
some places that "mating surfaces" must be primed.  Is that all mating
surfaces?  Everywhere a skin touches a rib?  Or is this just mating
surfaces where one of the parts is not alclad?

Is everything that isn't alclad obviously not alclad?  For instance, the
VS-1014 spar caps look different from most of the sheet metal.  Is it
alclad?  Does it need to be primed?  Or should it be primed anyway
because it sits on top of the VS rear spar?

What about the edges of everything?  Clearly there's no alclad there...
should I be worried about that?  I really don't want to prime where it's
not necessary (time, weight, and the aircraft is going to be in Colorado
where nothing ever corrodes), but finding guidance for what's required
is tough.

Thanks,
Berck

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carl.froehlich(at)verizon
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PostPosted: Sat Mar 01, 2014 5:41 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

If you going to go to the trouble of priming all those hard to prime non-alclad parts then prime everything.  The additional work is minimal considering the total build.  The other consideration is even if you don’t view the need to prime at some point you may want to sell and this may make a difference to the new buyer.

I never thought I would sell my RV-8A – but it is now flying with a happy new owner.

Carl

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bob Condrey
Sent: Saturday, March 01, 2014 7:09 AM
To: rv10-list(at)matronics.com
Subject: Re: Greetings ... and minimalist priming questions.


Minimal is to prime only the non-alclad aluminum. The limits priming to parts you make from the extruded angle and stock. Skins, ribs and the stamped out parts are all alclad. Don't worry about the edges.


Bob

On Saturday, March 1, 2014, Berck E. Nash <flyboy(at)gmail.com (flyboy(at)gmail.com)> wrote:
--> RV10-List message posted by: "Berck E. Nash" <[url=javascript:;]flyboy(at)gmail.com[/url]>

Hi there. I've just started on an RV-10 and have a few questions that
searching has not yielded answers to. I know everyone loves priming
questions, but I really have tried to search for the answers first.

I've decided to only prime things that absolutely must be primed, but
I'm having trouble figuring out which things those are. I've read in
some places that "mating surfaces" must be primed. Is that all mating
surfaces? Everywhere a skin touches a rib? Or is this just mating
surfaces where one of the parts is not alclad?

Is everything that isn't alclad obviously not alclad? For instance, the
VS-1014 spar caps look different from most of the sheet metal. Is it
alclad? Does it need to be primed? Or should it be primed anyway
because it sits on top of the VS rear spar?

What about the edges of everything? Clearly there's no alclad there...
should I be worried about that? I really don't want to prime where it's
not necessary (time, weight, and the aircraft is going to be in Colorado
where nothing ever corrodes), but finding guidance for what's required
is tough.

Thanks,
Berck

===========
" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
MS -
k">http://forums.matronics.com
===========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========

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Kellym



Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

PostPosted: Sat Mar 01, 2014 6:26 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

Oh boy, here go the primer wars!
The contrarian view is that primer just adds weight to the overall
aircraft. There are many Cessnas flying from the early 50s that had no
primer used at all.
Priming any steel that isn't already powder coated will prevent
dissimilar metal corrosion. Takes very little effort to prime extruded
aluminum parts with rattle can self etching primer. Only reason to prime
any alclad is if your scotchbrite efforts remove the alclad layer.
Mow, if you base the plane in Florida, Kalifornia and other corrosive
atmospheres, priming might be desirable. Resale would be the last reason
in my mind to do priming, since most builders are doing it to have the
plane for themselves. If you are worried about how the plane will sell
when you either quit flying or start a new project, maybe this isn't the
right project to build in the first place.

On 3/1/2014 6:41 AM, Carl Froehlich wrote:
Quote:

If you going to go to the trouble of priming all those hard to prime
non-alclad parts then prime everything. The additional work is
minimal considering the total build. The other consideration is even
if you don’t view the need to prime at some point you may want to sell
and this may make a difference to the new buyer.

I never thought I would sell my RV-8A – but it is now flying with a
happy new owner.

Carl

*From:*owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] *On Behalf Of *Bob Condrey
*Sent:* Saturday, March 01, 2014 7:09 AM
*To:* rv10-list(at)matronics.com
*Subject:* Re: Greetings ... and minimalist priming questions.

Minimal is to prime only the non-alclad aluminum. The limits priming
to parts you make from the extruded angle and stock. Skins, ribs and
the stamped out parts are all alclad. Don't worry about the edges.

Bob

On Saturday, March 1, 2014, Berck E. Nash <flyboy(at)gmail.com
<mailto:flyboy(at)gmail.com>> wrote:


<javascript:;>>

Hi there. I've just started on an RV-10 and have a few questions that
searching has not yielded answers to. I know everyone loves priming
questions, but I really have tried to search for the answers first.

I've decided to only prime things that absolutely must be primed, but
I'm having trouble figuring out which things those are. I've read in
some places that "mating surfaces" must be primed. Is that all mating
surfaces? Everywhere a skin touches a rib? Or is this just mating
surfaces where one of the parts is not alclad?

Is everything that isn't alclad obviously not alclad? For instance, the
VS-1014 spar caps look different from most of the sheet metal. Is it
alclad? Does it need to be primed? Or should it be primed anyway
because it sits on top of the VS rear spar?

What about the edges of everything? Clearly there's no alclad there...
should I be worried about that? I really don't want to prime where it's
not necessary (time, weight, and the aircraft is going to be in Colorado
where nothing ever corrodes), but finding guidance for what's required
is tough.

Thanks,
Berck

===========
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k">http://forums.matronics.com
===========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
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**
**
**
**
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**
*http://forums.matronics.com*
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**
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**
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arplnplt(at)gmail.com
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PostPosted: Sat Mar 01, 2014 7:17 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

I used T9-BOESHIELD on most parts and skins rather than prime. Good protection. Penetrates very well. Can easily be applied after assembly of parts. Just spray on and lightly wipe excess off. Little affect on weight. Easy.ACF-50 works the same.
http://boeshield.com
Dave Leikam


On Mar 1, 2014, at 8:25 AM, Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)> wrote:
[quote]--> RV10-List message posted by: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>

Oh boy, here go the primer wars!
The contrarian view is that primer just adds weight to the overall aircraft. There are many Cessnas flying from the early 50s that had no primer used at all.
Priming any steel that isn't already powder coated will prevent dissimilar metal corrosion. Takes very little effort to prime extruded aluminum parts with rattle can self etching primer. Only reason to prime any alclad is if your scotchbrite efforts remove the alclad layer.
Mow, if you base the plane in Florida, Kalifornia and other corrosive atmospheres, priming might be desirable. Resale would be the last reason in my mind to do priming, since most builders are doing it to have the plane for themselves. If you are worried about how the plane will sell when you either quit flying or start a new project, maybe this isn't the right project to build in the first place.

On 3/1/2014 6:41 AM, Carl Froehlich wrote:
[quote]
If you going to go to the trouble of priming all those hard to prime non-alclad parts then prime everything. The additional work is minimal considering the total build. The other consideration is even if you don’t view the need to prime at some point you may want to sell and this may make a difference to the new buyer.

I never thought I would sell my RV-8A – but it is now flying with a happy new owner.

Carl

*From:*owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) [mailto:owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)] *On Behalf Of *Bob Condrey
*Sent:* Saturday, March 01, 2014 7:09 AM
*To:* rv10-list(at)matronics.com (rv10-list(at)matronics.com)
*Subject:* Re: Greetings ... and minimalist priming questions.

Minimal is to prime only the non-alclad aluminum. The limits priming to parts you make from the extruded angle and stock. Skins, ribs and the stamped out parts are all alclad. Don't worry about the edges.

Bob

On Saturday, March 1, 2014, Berck E. Nash <flyboy(at)gmail.com (flyboy(at)gmail.com) <mailto:flyboy(at)gmail.com (flyboy(at)gmail.com)>> wrote:

--> RV10-List message posted by: "Berck E. Nash" <flyboy(at)gmail.com (flyboy(at)gmail.com) <javascript:;>>

Hi there. I've just started on an RV-10 and have a few questions that
searching has not yielded answers to. I know everyone loves priming
questions, but I really have tried to search for the answers first.

I've decided to only prime things that absolutely must be primed, but
I'm having trouble figuring out which things those are. I've read in
some places that "mating surfaces" must be primed. Is that all mating
surfaces? Everywhere a skin touches a rib? Or is this just mating
surfaces where one of the parts is not alclad?

Is everything that isn't alclad obviously not alclad? For instance, the
VS-1014 spar caps look different from most of the sheet metal. Is it
alclad? Does it need to be primed? Or should it be primed anyway
because it sits on top of the VS rear spar?

What about the edges of everything? Clearly there's no alclad there...
should I be worried about that? I really don't want to prime where it's
not necessary (time, weight, and the aircraft is going to be in Colorado
where nothing ever corrodes), but finding guidance for what's required
is tough.

Thanks,
Berck

===========
" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
MS -
k">http://forums.matronics.com
===========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
* *
* *
**
**
**
**
**
*[url=http://www.matronics.com/Navigator?RV10-List*]http://www.matronics.com/Navigator?RV10-List*[/url]
**
**
*[url=http://forums.matronics.com*]http://forums.matronics.com*[/url]
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**
* --> http://www.matronics========================[b] http://forums.matronics.com
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Rocketman1988



Joined: 21 Jun 2012
Posts: 63

PostPosted: Sat Mar 01, 2014 7:25 am    Post subject: Re: Greetings ... and minimalist priming questions. Reply with quote

I decided to prime everything. Looking back, now, if I did it again, I probably would use the Alodine process or not prime at all. People speak of the minimal time involved...well, it may be a minimal PERCENTAGE of the total build time but that is still a BUNCH of hours. And you have to factor in the time it takes for the primer to dry, too...

Also, if you are planning to use SW P60 G2, which is what Van's uses, call SW and talk to them about it. That primer, as they will tell you, is designed to topcoat within 4 HOURS, and although it may enhance corrosion resistance, it was not designed to be used as a stand alone protectant. Call them and talk to one of their techs...

There is no question that a properly primed metal will last longer than an unprimed one, so the question becomes, "Do you want an airplane that will last 60 years or 100 years?"


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Rocketman1988



Joined: 21 Jun 2012
Posts: 63

PostPosted: Sat Mar 01, 2014 7:37 am    Post subject: Re: Greetings ... and minimalist priming questions. Reply with quote

I decided to prime everything. Looking back, now, if I did it again, I probably would use the Alodine process or not prime at all. People speak of the minimal time involved...well, it may be a minimal PERCENTAGE of the total build time but that is still a BUNCH of hours. And you have to factor in the time it takes for the primer to dry, too...

Also, if you are planning to use SW P60 G2, which is what Van's uses, call SW and talk to them about it. That primer, as they will tell you, is designed to topcoat within 4 HOURS, and although it may enhance corrosion resistance, it was not designed to be used as a stand alone protectant. Call them and talk to one of their techs...

There is no question that a properly primed metal will last longer than an unprimed one, so the question becomes, "Do you want an airplane that will last 60 years or 100 years?"


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flyboy(at)gmail.com
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PostPosted: Sat Mar 01, 2014 8:24 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

Sorry to rekindle the debate, but I really do appreciate the input. So
those of you that are not priming are not even priming mating surfaces?
If this is acceptable, this is what I'd like to do. I don't care about
resale value, as I'm not planning on selling. Even if things don't go
as I plan and I need to sell for some reason, I'm willing to take the
"loss". For all I know there are buyers that would prefer to have
non-primed aircraft without the extra 3-8 pounds.

Determining which scratches in the alclad are deep enough to worry about
is the next question. I know I need to smooth any inadvertent scratches
I make with scotchbrite. Is it obvious if you go through the alcad?
Should I prime anything I scotchbrite?
On 03/01/2014 05:09 AM, Bob Condrey wrote:
Quote:
Minimal is to prime only the non-alclad aluminum. The limits priming to
parts you make from the extruded angle and stock. Skins, ribs and the
stamped out parts are all alclad. Don't worry about the edges.

Bob

On Saturday, March 1, 2014, Berck E. Nash <flyboy(at)gmail.com
<mailto:flyboy(at)gmail.com>> wrote:


<javascript:;>>

Hi there. I've just started on an RV-10 and have a few questions that
searching has not yielded answers to. I know everyone loves priming
questions, but I really have tried to search for the answers first.

I've decided to only prime things that absolutely must be primed, but
I'm having trouble figuring out which things those are. I've read in
some places that "mating surfaces" must be primed. Is that all mating
surfaces? Everywhere a skin touches a rib? Or is this just mating
surfaces where one of the parts is not alclad?

Is everything that isn't alclad obviously not alclad? For instance, the
VS-1014 spar caps look different from most of the sheet metal. Is it
alclad? Does it need to be primed? Or should it be primed anyway
because it sits on top of the VS rear spar?

What about the edges of everything? Clearly there's no alclad there...
should I be worried about that? I really don't want to prime where it's
not necessary (time, weight, and the aircraft is going to be in Colorado
where nothing ever corrodes), but finding guidance for what's required
is tough.

Thanks,
Berck

===========
" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
MS -
k">http://forums.matronics.com
===========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========



*


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Tim Olson



Joined: 25 Jan 2007
Posts: 2872

PostPosted: Sat Mar 01, 2014 8:31 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

There is something I'm not sure of....are the dull aluminum wing ribs
alclad too, or
is it just the shiny ones? I wasn't sure, actually, so I always primed
everything
that wasn't shiny.

On the -14 I've been priming with Akzo again, but not alodining (other
than a few
small parts made from stock and such). I did love the alodining on the
-10 and if
I were keeping a plane forever I'd do it I guess, but the -14 isn't
going to be my
forever plane. I scuff and spray with Akzo. The only real hassle is
the 30 minute
post-mixing time before you can spray.

I just this week decided to get around that for some small prime jobs by
buying
some actual Zinc Chromate primer. In tests I've seen in past years,
Zinc Chromate
was actually one of the better corrosion preventers. So I got a couple
cans for
real small parts that hold up my progress if I have to wait for
priming. There
are times that wanting to prime means getting a lot of parts ready at
once or
you hit a delay, and sometimes I just don't want that hassle anymore.
So for
me it'll be Zinc Chromate in those areas.

I agree on the wash primer thing....it's not a sealer, so I'd rather
either not
use anything or pick a better product. And the only places I would not
use anything are maybe if you have the inside of skins that are alclad...and
you still prime the mating surfaces. To me, a totally unprimed plane would
not be one I'd be interested in buying, if I was shopping around. If at
least
the mating surfaces were primed, I'd consider it. But you can't inspect
those mating areas real easily and that's exactly where moisture and
everything else will collect and stay. So I wouldn't skip that part.

So Berck, your thoughts are basically the same as mine as to what "looks"
like alclad. But for me, I'd at least get a couple cans of primer and spray
the mating surfaces.

BTW: Yeah, people talk about Zinc Chromate as an awful thing from
a toxicity standpoint. I wouldn't want to do the whole airframe with it,
but for small areas, I'm not going to worry. Use a respirator for sure.
I have tried the rattle can self-etching primers of a couple brands and
found
that they were horrible from a durability standpoint. To me, they're
worthless. Akzo is tough, and after 8 years on the RV-10 it's looking
great still. If you do go rattle-can self-etching, I'd topcoat it with
something
tougher for sure....it also is not a sealer.

One more tip...the Zinc Chromate I got on skygeek.com and paid only
$4 per can for.

Tim
On 3/1/2014 6:09 AM, Bob Condrey wrote:
Quote:
Minimal is to prime only the non-alclad aluminum. The limits priming
to parts you make from the extruded angle and stock. Skins, ribs and
the stamped out parts are all alclad. Don't worry about the edges.

Bob

On Saturday


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jack(at)bedfordlandings.c
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PostPosted: Sat Mar 01, 2014 9:18 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

The question for me was weight. As has been mentioned, Cessna did not prime
anything back in the 40's and 50's. In 2002, I looked carefully throughout
my 1947 Cessna 140, and found no priming and no corrosion, even after 55
years.

When I built my Pietenpol Air Camper, I primed the aluminum cowling with
PolyFiber's epoxy primer, which I believe is one of the very best for
providing nearly bulletproof protection, as well as a good surface to paint.
I was amazed at how much weight the primer added. With epoxy primer, very
little solvent evaporates, instead the epoxy cures like any other epoxy.
Hence, the weight of the can of primer is pretty close to the weight of the
cured primer on your airplane, and it is substantial. If all surfaces of a
plane the size of an RV10 were primed with epoxy primer, you could easily
add 60 to 80 lbs to the airframe

My RV4 (I was not the builder) was not primed and has been flying for 27
years now, with no corrosion. It is also one of the lightest RV4's around,
weighing just 924 lbs empty (Van's prototype weighed 908, without the
electric flaps and electric trim that mine has). Even with only 150 hp it
easily outruns heavier RV4's with 180 hp engines. So weight matters.

Now all I need to do is get back to work on my RV10.

Jack Phillips
Smith Mountain Lake, Virginia
RV10 #40610
Tail done, Wings done, need to order the fuselage kit

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Bob Turner



Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

PostPosted: Sat Mar 01, 2014 10:34 am    Post subject: Re: Greetings ... and minimalist priming questions. Reply with quote

Lots of opinions!
I did prime; if I were doing it again, I would not. It did take a lot of time, mostly in the prep work, not the actual painting. I didn't have a permanent paint booth so every batch required a lot of set up/take down time.

I would spray ACF50 or similar every few years. That stuff gets everywhere (paint prior to spraying ACF50). I live in CA but away from the coast where the weather is dry most of the year.


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PostPosted: Sat Mar 01, 2014 2:05 pm    Post subject: Greetings ... and minimalist priming questions. Reply with quote

I think the definition of 'minimal priming' is only priming those parts
where Vans explicitly suggests priming. That's very few parts and areas.

I started with epoxy priming every part, moved on to a wash primer,
ended up in 'minimal priming' mode despite the fact that I had a spray
booth by then and did my own exterior paint.

Bill "with no priming recommendation" Watson

On 3/1/2014 1:21 AM, Berck E. Nash wrote:
Quote:


Hi there. I've just started on an RV-10 and have a few questions that
searching has not yielded answers to. I know everyone loves priming
questions, but I really have tried to search for the answers first.

I've decided to only prime things that absolutely must be primed, but
I'm having trouble figuring out which things those are. I've read in
some places that "mating surfaces" must be primed. Is that all mating
surfaces? Everywhere a skin touches a rib? Or is this just mating
surfaces where one of the parts is not alclad?

Is everything that isn't alclad obviously not alclad? For instance, the
VS-1014 spar caps look different from most of the sheet metal. Is it
alclad? Does it need to be primed? Or should it be primed anyway
because it sits on top of the VS rear spar?

What about the edges of everything? Clearly there's no alclad there...
should I be worried about that? I really don't want to prime where it's
not necessary (time, weight, and the aircraft is going to be in Colorado
where nothing ever corrodes), but finding guidance for what's required
is tough.


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johngoodman



Joined: 18 Sep 2006
Posts: 530
Location: GA

PostPosted: Sun Mar 02, 2014 6:38 am    Post subject: Re: Greetings ... and minimalist priming questions. Reply with quote

I didn't prime, except for where it was called for - or needed. I kept a rattle can of "self etching primer" handy, and used a cardboard box outdoors to hit it (wear a mask). Ask for it at any paint or auto store.
I also kept a spray can of T9 Boeshield handy - as Kelly suggested. Great product.

John


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AirMike



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PostPosted: Wed Mar 05, 2014 7:58 am    Post subject: minimalist priming questions. Reply with quote

Having owned a plane with filiform corrosion (a Piper), I was sensitive to the issue. I trained with Wally Anderson at Synergy in Eugene,OR. and he primes everything with a wash primer. I felt that if it was the way that Wally went, that I would do the same. I feel that it added only nominal weight and it looks great. I also used an epoxy primer from DuPont that is tough as nails on the floors and sidewalls. My attitude is - corrosion will never be a worry for me or the person to whom I sell the plane. My weight is 2620#.

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PostPosted: Wed Mar 05, 2014 8:24 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

I hope you meant 1620#. Smile

Rene' Felker
N423CF
801-721-6080

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amekler



Joined: 07 Oct 2010
Posts: 164

PostPosted: Wed Mar 05, 2014 10:45 am    Post subject: Greetings ... and minimalist priming questions. Reply with quote

Sent from my iPhone

[quote] On Mar 5, 2014, at 11:24 AM, "Rene Felker" <rene(at)felker.com> wrote:



I hope you meant 1620#. Smile

Rene' Felker
N423CF
801-721-6080

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AirMike



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PostPosted: Wed Mar 05, 2014 7:23 pm    Post subject: minimalist priming questions. Reply with quote

yea - yea - 1620#

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