rmkearbey:

Are you planning on glassing a built up wing or a foam wing? If it is a built up wing, glassing it will not cause depressions between the ribs nor will sanding as long as you do not take off too much wood. When you sand the sheeting, I assume the sheeting is 1/16th, you want to lightly sand it, just enough to smooth it out. Use a lite weight filler if needed. Try to get the sheeting as smooth as possible without removing too much wood. There are many post on the process. Do a search and you should find lots of info. If you need more info I will be glad to assist or you can post a question in the warbird section. All the warbird drivers use glass their birds using the same are similar techniques.