fabric as that is the only way to make it penetrate and adhere to the
polytack holding the fabric on. Basically that is the only way the polybrush
can stick to the fabric itself by working it thru with the brush to overlap
the back of the fabric. If you just sprayed on the 1st coat it would only
end up on the top surface and could peal off. The Polyspray (silver) is
recommended to be sprayed on only to achieve a smooth finish prior to finish
paint. Technically you could brush on the Polyspray but you would not get
rid of the brush marks as it dries so fast. Hence their respective names
(Polybrush/Polyspray) After the Polyspray(silver) has been applied and
normally a minimum of three coats for UV protection, you can apply various
finish paint coatings on it after it has cured. It can also be lightly
sanded to remove runs, (but recoat) On my 1st Rebel, I used Sico Acurthane
(2 part epoxy type) over the fabric with great results. I still have my test
sample frame after six years and the coating is still durable and flexible.
Best regards. Bob J Rebel 652,725,192/731
----- Original Message -----
From: <rognal@dcsol.com>
To: <rebel-builders@dcsol.com>
Sent: Saturday, July 14, 2007 4:15 PM
Subject: [rebel-builders] re: poly fibre questions
Mike,
I don't have the PolyFiber manual in front of me but if I recallpage 26 shows how to do the 1st coat of poly brush using a paint brush,
but
it never talks about a 2nd brush coat, then latter in manual there is a
1st
and second spray coat of poly brush, do i have to spray these coats, i
dont
have spray equipment and dont want to go buy it
correctly,
it calls for three coats of PolyBrush. Each coat of PolyBrush is applied
with a brush. Don't confuse PolyBrush with PolySpray. PolySpray is applied
with paint spraying equipment.
I prepped the aluminum flaperon structure as you indicate (per the PFwhat about aluminum prep for fabric covering, manual says to clean with
acid
etch and brightener, then conversion coating, then spray with epoxy
primer,
s everone doing this or just scotch bright pads on the surface to clean it
throughly and then mek or lacquer thinner
manual). As I recall the PF manual says you can skip either the acid etch
or the conversion coating (I don't remember which) IF you are prepping new
aluminum surfaces. After that step I applied a couple light coats of
PolyFiber EP420/430 epoxy primer to the structure before beginning the
covering process.
Hope this helps,
Roger Hoffman
Eugene, OR USA!
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