fiberglass cloth

[Bootlegger]

  When you apply fiber glass cloth to a foam wing center section, how do you keep the cloth still when you apply the epoxy resin?
                   Thanks

[Mark Scarborough]

You can use a light dusting of spray adhesive,, or you can brush a dry coat of resin on the balsa,, lay the cloth, then either after it cures slightly ( my preference), or immediatly, you can brush a light coat of resin. if you use to much resin the cloth will "float" up off the surface so dont use any more than needed. thats why I like to put on a very dry layer,, lay the cloth and rub it down, then after an hour or so, put another thin coat of resin over it

[Paul Wood]

Lay the cloth in place and smooth out the wrinkles. Then spray a mist of hair spray over the entire area. Use solvent based hair spray rather than water based. This will hold it in place well enough to allow you to apply the resin and then work out the final surfacing.

[Fred Cronenwett]

I put a thin coat Finishing resin on the balsa and then lay down the figerglass cloth. then pour some more resin and start in the middle working my way out from the center. The cloth may move slightly but not a problem since I have excess around the part. I have never worried about the cloth moving when working out all of the wrinkles, just make sure you have enough around the edges so it can be trimmed after it's cured.

After that has cured (I let it dry overnight), then sand it really smooth with 320 or finer. Then put a 2nd round of finishing resin down to really fill the pin holes. this gets sanded with 1000 or finer, primer, sand again to see where the low spots are.

All of this assumes you have balsa skins over the foam wing and they are sanded smooth, any defects in balsa skin show thru the fiberglass job

Fred