Applying poly glue

[Rcmaster199 at aol.com]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20041003/9530d931/attachment.html