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Prepping fibreglass surfaces

 
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kearney



Joined: 20 Sep 2008
Posts: 563

PostPosted: Sun May 17, 2009 6:45 am    Post subject: Prepping fibreglass surfaces Reply with quote

Hi

Looking through the archives I have seen references to using acetone (Rick Sked) to clean fibreglass prior to applying epoxy. I have been using lacquer thinner in my cleanup which contains toluene as an active ingredient. Is this an acceptable substitute for the acetone for prep work?

Inquiring minds need to know

Les
#40643 living in a fiberglass world
[quote][b]


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ricksked(at)embarqmail.co
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PostPosted: Sun May 17, 2009 7:23 am    Post subject: Prepping fibreglass surfaces Reply with quote

Les,Wash all the parts first in dawn dish soap and hot water....then I wiped everything down with acetone, I used Loehle wonder fill then their black high dill primer sanded and patched the weave with Metal glaze and shot white high fill primer...were doing that as I write this. Acetone is just a good cleaner to get stubborn mold release out if present after washing...the thinned epoxy was not needed with the wonderfull but I did use it on the cowl due to the potential oil and fuel exposureRick
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From: "Les Kearney"
Date: Sun, 17 May 2009 08:26:03 -0600
To: <rv10-list(at)matronics.com>
Subject: RV10-List: Prepping fibreglass surfaces

Hi
 
Looking through the archives I have seen references = to using acetone (Rick Sked) to clean fibreglass prior to applying epoxy. I have = been using lacquer thinner in my cleanup which contains toluene as an active ingredient. Is this an acceptable substitute for the acetone for prep = work?
 
Inquiring minds need to = know
 
Les
#40643 living in a fiberglass = world
Quote:
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PostPosted: Sun May 17, 2009 12:24 pm    Post subject: Prepping fibreglass surfaces Reply with quote

Hi Les C

I asked the same question of PolyFiber the manufacturer of UV Smoothprime. They recommended using acetone and not substituting lacquer thinner when preparing fiberglass for their primer. The reasoning had to do with acetones faster evaporation rate and not leaving residual solvents behind.

Vern Smith (#324 finishing)

From: kearney(at)shaw.ca
To: rv10-list(at)matronics.com
Subject: RV10-List: Prepping fibreglass surfaces
Date: Sun C 17 May 2009 08:26:03 -0600

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Hi
 
Looking through the archives I have seen references to using acetone (Rick Sked) to clean fibreglass prior to applying epoxy. I have been using lacquer thinner in my cleanup which contains toluene as an active ingredient. Is this an acceptable substitute for the acetone for prep work?
 
Inquiring minds need to know
 
Les
#40643 living in a fiberglass world
Quote:
http://www.matronics.com/Navigatwww.matronics.com/contribution">http://www.matronics.com/contribution
Insert movie times and more without leaving HotmailŪ. See how. [quote][b]


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daveleikam(at)wi.rr.com
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PostPosted: Sun May 17, 2009 3:24 pm    Post subject: Prepping fibreglass surfaces Reply with quote

Why would you want to apply anything to clean the surface? I am no expert but wouldn't a good scrubbing with 80-100 grit sand paper give a nice bare raw surface to apply epoxy to?

Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI

[quote] ---


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pitts_pilot(at)bellsouth.
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PostPosted: Sun May 17, 2009 3:41 pm    Post subject: Prepping fibreglass surfaces Reply with quote

You want to get rid of the powder from sanding that's down in the pores
..... it'll help everything stick better.
Linn

Dave Leikam wrote:
[quote] Why would you want to apply anything to clean the surface? I am no
expert but wouldn't a good scrubbing with 80-100 grit sand paper give a
nice bare raw surface to apply epoxy to?

Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI

---


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PostPosted: Sun May 17, 2009 3:43 pm    Post subject: Prepping fibreglass surfaces Reply with quote

You need to wash all oils and mold release agents off or you will scrub them into the pin holes and contaminate the surface when you sand them
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From: "Dave Leikam"
Date: Sun, 17 May 2009 18:23:54 -0500
To: <rv10-list(at)matronics.com>
Subject: Re: RV10-List: Prepping fibreglass surfaces
Why would you want to apply anything to clean = the=20 surface?  I am no expert but wouldn't a good scrubbing with 80-100 = grit=20 sand paper give a nice bare raw surface to apply epoxy to?
 
Dave Leikam
RV-10 #40496
N89DA=20 (Reserved)
Muskego, WI

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PostPosted: Sun May 17, 2009 5:11 pm    Post subject: Prepping fibreglass surfaces Reply with quote

Blow off dust with compressed air to remove? If the pores are full, the
particles would need to be dissolved to remove with solvent? Again, I am
just a lowly airplane cobbler. Educate me.

Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI
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PostPosted: Sun May 17, 2009 5:39 pm    Post subject: Prepping fibreglass surfaces Reply with quote

Dave,

Its really not hard...wash the parts with soap and water..sand the parts to remove the gloss, smooth rough spots and wipe with acetone to clean. Compressed air is fine but I like to vacuum. Use your primer/filler of choice...I just happen to be using Mike Loehle's paint system which uses his pin hole filler called wonderfil...you rub it into the glass parts and when the primer hits it, it fuses with the wonderfil and seals the pin holes...sand the primer, use filler (I like Metal Glaze by Evercoat) to fix any weave, rub more wonderfil into any existing pin holes and prime again...sand and your ready for paint. This is the best stuff I've ever used...and his paint and primer is awesome...

Rick Sked
N246RS
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PostPosted: Sun May 17, 2009 5:41 pm    Post subject: Prepping fibreglass surfaces Reply with quote

There is a lot of contamination on the FG BEFORE you even sand ......
oils from your hands .... mold release .... dirt and dust from the shop
... which should all be cleaned off before you sand. Sanding with all
the crud on there pushes a lot of it down into the FG. Soapy water (hot
if you can get it)and a red 3M pad works wonders. Plenty of water to
flush all the bad stuff away. Let it dry real good before you sand.

As you sand, the dust is pushed down into the FG. Acetone will soften
the powder and give the surface of the FG a little 'nap' as the little
strands of glass stand up .... and give whatever you put on the surface
something better to adhere to. Without the acetone and some mechanical
(your rag or 3M pad) the dust will become a barrier between your next
material you put on it (more epoxy or paint).

Quoting Dave Saylor:
Scuffing with 80 grit then wiping with acetone is the standard prep
before applying resin. 80g mechanically opens up the material, then the
acetone washes and softens up the resin to make it ready for the resin.

... which also works if you're spraying primer on it.

Blowing the dust off gets the surface stuff, but not the embedded stuff,
and it's real hard to make sure the whole surface gets the strongest air
blast. Not totally effective.

We're all lowly airplane builders .... some of us have worked with
various materials before, and mostly learned the hard way .... by
finding what works and what doesn't. ..... and we all were educated by
someone else. Nobody is born with this knowledge!!!
Hope this helps.
Linn

Dave Leikam wrote:
Quote:


Blow off dust with compressed air to remove? If the pores are full, the
particles would need to be dissolved to remove with solvent? Again, I
am just a lowly airplane cobbler. Educate me.

Dave Leikam
RV-10 #40496
N89DA (Reserved)
Muskego, WI


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PostPosted: Sun May 17, 2009 7:05 pm    Post subject: Prepping fibreglass surfaces Reply with quote

On 5/17/2009 9:37 PM, linn wrote:
Quote:
Quoting Dave Saylor:
Scuffing with 80 grit then wiping with acetone is the standard prep
before applying resin. 80g mechanically opens up the material, then the
acetone washes and softens up the resin to make it ready for the resin.


I bought some stuff called "Replacetone"
<http://www.aircraftspruce.com/catalog/cmpages/replacetone.php> for
cleanup mostly because it is a lot more "safe" than acetone.

Would this also work as a substitute for acetone for prepping
fiberglass work?

-Dj


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speckter(at)comcast.net
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PostPosted: Mon May 18, 2009 4:40 am    Post subject: Prepping fibreglass surfaces Reply with quote

Replacetone will work for cleaning containers and tools, but do not use it
to prep the fiberglass. It is non volatile and will not easily evaporate
from the glass surface. Additionally it does not dissolve the resins and
IMHO will not properly prep the surface. Acetone is not very toxic if you
use common sense and don't bathe in it or sniff it to get high. Use
appropriate methods and it is the best material for the job.

Gary Specketer

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