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Searching for a self-etching primer

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pbarker(at)hughes.net
Guest

Posted: Tue Nov 21, 2006 8:59 pm Post subject: Searching for a self-etching primer

This is not intended to re-ignite the primer wars, but my building 

partner and I have decided to prime the inside of our aircraft. Although 

corrosion isn't a big issue here in the middle of the middle west, we 

don't know that the aircraft will spend all of its days here.



We want to keep it simple. We've heard some passing references to 

self-etching primers and would like to know which ones folks have been 

using with success. We would like to find something that comes packaged 

in rattle cans for small jobs, but is also available by the gallon when 

we move to larger assemblies.



P. A. Barker

RV-9 (tail kit)

Brad Oliver

Joined: 10 Jan 2006
Posts: 6
Location: Livermore, CA

Posted: Tue Nov 21, 2006 9:54 pm Post subject: Searching for a self-etching primer

Have a look at SEM Self-Etching Primer.  It comes in rattle-cans, quarts,

and gallons.

http://www.sem.ws/product.php?product_id=139



I really like the stuff.



Brad Oliver

RV-7 | Livermore, CA

www.RV7Factory.com

--

smittysrv

Joined: 10 Jan 2006
Posts: 67

Posted: Wed Nov 22, 2006 3:52 am Post subject: Searching for a self-etching primer

I'm using 988 - G.B.P. Self Etching Primer Aerosol from Sherwin Williams and 

like it a lot.



http://www.sherwin-automotive.com/products/show_product.cfm?product=7565



Smitty's RV-9A

http://SmittysRV.com

---

_________________
Smittys RV-9A
SmittysRV.com

Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Wed Nov 22, 2006 4:37 am Post subject: Searching for a self-etching primer

In a message dated 11/21/2006 11:01:11 PM Central Standard Time, pbarker(at)hughes.net writes:

  	  Quote: 	
		  We've heard some passing references to 

self-etching primers and would like to know which ones folks have been 

using with success. 	


 Have a look-see here:

  

 http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=4863

  

 Still very pleased with the 988.

  

 From The PossumWorks in TN

 Mark

  [quote][b]

_________________
From The PossumWorks...

Dale Ensing

Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

Posted: Wed Nov 22, 2006 5:14 am Post subject: Searching for a self-etching primer

Paul,

I used both the SW and the SEM self etching primers and found them equal in 

performance. Suggest you buy the one that is convenient for you to purchase.

Not sure if either one is available in exact same formulation in gallons.



I switched to the rattle cans after using a gallon of the SW wash primer. 

Hard to beat the convenience of the rattle cans.



Application note for rattle cans:

    Spray on light wet coats. If applied too dry (rattle can too far from 

substrate) the acid etch can not do it's job of getting a bite into the 

aluminum.



Dale Ensing



 	  Quote: 	
		   We want to keep it simple. We've heard some passing references to 

 self-etching primers and would like to know which ones folks have been 

 using with success. We would like to find something that comes packaged in 

 rattle cans for small jobs, but is also available by the gallon when we 

 move to larger assemblies.



 P. A. Barker

 RV-9 (tail kit)

_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC

brianpublic2(at)starband.
Guest

Posted: Wed Nov 22, 2006 7:50 am Post subject: Searching for a self-etching primer

Everyone will have a different opinion on primers, but I used to use SEM and

now I use the NAPA brand.  The NAPA brand has a much better nozzle and in my

experience, the paint stick better.

brian

http://brian76.mystarband.net/RV-7Ahome.htm

--

randy(at)romeolima.com
Guest

Posted: Wed Nov 22, 2006 9:09 am Post subject: Searching for a self-etching primer

Ditto on the SEM, further info here...

http://www.romeolima.com/RV3works/Airframe/airframe.htm#Primer



Randy Lervold

---

BAGSTERJR(at)msn.com
Guest

Posted: Wed Nov 22, 2006 2:27 pm Post subject: Searching for a self-etching primer

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  I am using the alumiprep, alodine, and AKZO two part epoxy primer on all  structural parts and using the Stewart Systems white primer on the insides of  all skins.  The Stewart Systems product is great, easy to spray with a  small air detail spray gun and cleans up easy with water.  MY reasons are  that I am told it make for easy detection for any cracks in interior, leaking  fluids, smoking rivets, and brightens up interior when inspecting.  I am  really happy with the ease of application and the toughness of the product (read  fairly resistant to scratching when assembling parts).

 I do not use it fast enough to buy the gallons, but I buy it by the  quart.  Roughly six quarts will do all interior skins on a -7.  I have  a friend who is using it on all skins and all structural parts on a 9A.  He  turned me on to the product and it is great!  I probably will be painting  my exterior with Stewart Systems also.

  

 Bill Agster

 7A-N174BJ reserved

 [quote]   ---

HCRV6(at)comcast.net
Guest

Posted: Wed Nov 22, 2006 4:24 pm Post subject: Searching for a self-etching primer

SEM self etching primer is good but a word of caution is in order.  If you plan to apply a finish coat over the SEM you must first lay on a coat of regular primer that is compatible with the finish.  If you skip this step you will find that the finish coat doesen't adhere well to the SEM and the top coat will eventually start to peel in places, usually the most visible and obvious places.  Don't bother asking me how I learned this.



--

Harry Crosby

RV-6 N16CX, 291 hours



 -------------- Original message ----------------------

From: "Bradley Oliver" <brad(at)rv7factory.com>

[quote] 

 

 

 Have a look at SEM Self-Etching Primer.  It comes in rattle-cans, quarts,

 and gallons.

 http://www.sem.ws/product.php?product_id=139

 

 I really like the stuff.

 

 Brad Oliver

 RV-7 | Livermore, CA

 www.RV7Factory.com

 

 

 --

pcowper(at)webtv.net (Pet
Guest

Posted: Wed Nov 22, 2006 4:47 pm Post subject: Searching for a self-etching primer

The owner of my local PPG store recommended the SEM Self-Etching Primer

in a rattle can for small parts.  He said it will be fine to later spray

PPG primers and top coats over it.



Pete Cowper

RV-8 #81139

randy(at)romeolima.com
Guest

Posted: Fri Nov 24, 2006 6:49 pm Post subject: Searching for a self-etching primer

Harry, did you scuff the SEM surface first? I've used SEM on all interior 

parts and then scuffed it with Scotchbrite fairly thoroughly when it came 

time to paint. I'm not flying yet so I don't know if I'll have an adhesion 

problem but not so far.



Randy Lervold

www.rv-3.com



---

HCRV6(at)comcast.net
Guest

Posted: Sun Nov 26, 2006 5:28 pm Post subject: Searching for a self-etching primer

Randy,



Yes, I  scrubbed all my parts with Simple Green, thoroughly rinsed and scuffed them with Scotch Brite before applying the SEM primer.  After discovering the finish coat peeling problem I went back to the local distributor for SEM and one of the old hands there told me that I should have used an intermediate primer over the SEM etching primer.  The peeling hasn't happened everywhere (so far), only in places where it really shows up.  Fortunately I used a top coat that is pretty close to the color of the SEM or it could be worse.



--

Harry Crosby

RV-6 N16CX, 291 hours



 -------------- Original message ----------------------

From: "Randy Lervold" <randy(at)romeolima.com>

[quote] 

 

 Harry, did you scuff the SEM surface first? I've used SEM on all interior 

 parts and then scuffed it with Scotchbrite fairly thoroughly when it came 

 time to paint. I'm not flying yet so I don't know if I'll have an adhesion 

 problem but not so far.

 

 Randy Lervold

 www.rv-3.com

 

 ---

ronlee(at)pcisys.net
Guest

Posted: Sun Nov 26, 2006 6:12 pm Post subject: Searching for a self-etching primer

 	  Quote: 	
		  Yes, I  scrubbed all my parts with Simple Green, thoroughly rinsed and 

scuffed them with Scotch Brite before applying the SEM primer.  After 

discovering the finish coat peeling problem I went back to the local 

distributor for SEM and one of the old hands there told me that I should 

have used an intermediate primer over the SEM etching primer.  The peeling 

hasn't happened everywhere (so far), only in places where it really shows 

up.  Fortunately I used a top coat that is pretty close to the color of 

the SEM or it could be worse.


	


I have heard (unverified) that Simple Green is not good for Aluminum.

There may be a formulation that is so ask around



Ron Lee

cjensen(at)dts9000.com
Guest

Posted: Mon Nov 27, 2006 7:24 am Post subject: Searching for a self-etching primer

The original formulation of Simple Green is definitely NOT good for

aluminum.  If it gets in a crack, crevice, overlap joint or other

hideouts, it is highly corrosive.  The Air Force has a ban on Simple

Green for use with aircraft.  Within the last few months, Simple Green

has brought out an 'aircraft formulation' of the product, which

supposedly will not aggressively corrode aluminum.  An excellent cleaner

but use with care and Read-the-Label to make sure you are using the

correct one.  Note: Even the old formulation, when used on open sections

of aluminum and thoroughly wiped away, will cause no problem, but rivet

heads and seams are impossible to remove all the SG.



Chuck Jensen

--

ceengland(at)bellsouth.ne
Guest

Posted: Mon Nov 27, 2006 5:30 pm Post subject: Searching for a self-etching primer

Chuck Jensen wrote:



 	  Quote: 	
		  



The original formulation of Simple Green is definitely NOT good for

aluminum.  If it gets in a crack, crevice, overlap joint or other

hideouts, it is highly corrosive.  The Air Force has a ban on Simple

Green for use with aircraft.  Within the last few months, Simple Green

has brought out an 'aircraft formulation' of the product, which

supposedly will not aggressively corrode aluminum.  An excellent cleaner

but use with care and Read-the-Label to make sure you are using the

correct one.  Note: Even the old formulation, when used on open sections

of aluminum and thoroughly wiped away, will cause no problem, but rivet

heads and seams are impossible to remove all the SG.



Chuck Jensen

  




	


I'd just like to say thanks for a rational view of the issue. People 

seem to forget that acid etch is pretty corrosive to AL, too, if you 

fail to clean it off.



Charlie

do not archive

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