this has been my favorite building method for years and here's some tips:

if using brown paper over one of the stiffer, heavier extruded foams you don't need any wood for spars or leading edges. even newspaper over white beaded foam is strong enough if the wing is low aspect ratio with a thick airfoil

use yellow carpenters glue like elmers thinned 50/50, white glues end up a bit rubbery when dried and are hard if not impossible to sand at the seams

wet the paper, even soak it before putting it on the wing. the good brown kraft paper can be dipped in the bathtub and not come apart. when wet it expands and then tries to shrink back to it's original size while drying...this is the secret to a very taught, wrinkle free covering. this can also distort the shape of the wing so the type of paper should be matched to density of foam, brown over 1 lb. beaded foam can be tricky...

once the paper is on the wing you don't need any more coats of glue, let it dry, sand it and then seal it with whatever finish you're doing. i sometimes put light glass over the paper, makes a much stiffer, stronger and lighter wing than glass directly over the foam. if using something water based to seal/finish the paper you might see some wrinkles start to come out but they should go away once dry


dave