Applying poly glue

[wgalligan]

Your right Matt,
 
I used to use 50/50 thin Nitrate dope and it is more expensive and takes
much longer to dry then hairspray, but works real well.  I have switched
to using the cheapest hair spray I can find and spry the skins.  Lightly
sand them and then put the glue on the skins.  Lightly mist the cores
before applying the skins.  Works great every time.
 
Wayne Galligan
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Rcmaster199 at aol.com
Sent: Sunday, October 03, 2004 7:57 PM
To: discussion at nsrca.org
Subject: Re: Applying poly glue
 
Hairspraying skins is a good and light method to seal the wood against
things like epoxy and poly-U glue, controlling the amount of glue
absorption into the wood. It is not a good material to seal against
water. Remember that hairsprays are generally water soluble. If you want
to seal against water and keep things as light as possible, a coat of
nitrate dope thinned 50% will work better. Make sure you let the dope
breathe for a couple days before proceeding.
 
Better yet, do as this gentleman suggests and use the hairspray to seal
the skins but don't water spray them. Poly-U will still adhere fine
except it will not foam up as it cures. As long as there's some humidity
(70%+) in the room, the glue will still polymerise. 
 
Or you can use epoxy as your adhesive. My favorite is Pro Set 125 resin
with 229 hardener from Gougebn Bros. It has the lowest viscosity and
excellent pot life of over 1 hour. Cure is 12-24 hours for 80%. Max 100%
cure in a week or so
 
MattK
A very easy way to do this is to, spray the skins , on the side that
will
touch the core, with hairspray. Let that dry. Then lightly mist the core
and
the skin with water, spread the glue with a credit card or squeegee very
thin but even coating of glue and then press, vacuum or weight them down
overnight and your done.
----- Original Message -----
From: "Scott Smith" <js.smith at verizon.net>
To: <discussion at nsrca.org>
Sent: Sunday, October 03, 2004 8:43 AM
Subject: Applying poly glue


> As we transition into building season...
>
> I was wondering, for those who roll polyurethane glue onto the wing
skins,
> do you use some sort of rolling pan?  Seems like it could get real
messy
and
> hard to clean up!
>
> On the other hand, dispensing directly to the skins then spreading
with
the
> roller would defeat the purpose...that being a thin even coat.
>
> What kind of roller pad are you using?
>
> I saw this method of pressing the cores (scroll to bottom):
> http://www.kj-tech.dk/page2.htm
>
> Sure beats stacking weights!
>
> Thanks for any suggestions,
>
> Scott
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