Regarding the very good advises, it seems that glassing doesn't require a lot of resin if we want to keep the weight light.

Any idea of the approximate amount of epoxy resin needed to glass a Top Flite P40 which is a .60 to .90 size plane (68" wingspan) ?
West System sells it by quart, Z-Poxy by 6+6 ounces containers, I don't know what I should order ! This stuff is expensive and I am not keen to waste it on a shelf.

Thanks for your help, Chris.