what i always do when building a kit is attach the wing and then use a cross grain sheet of 1/16 balsa as a guide, wrapping it around the wing and marking the fuselage with a pencil, that'll give me a line exactly 1/16" from the wing surface to the fuselage, i then sand the fuse to that line (don't sand away the line just up to it) then when you finish the covering add 1/16" wing tape for a perfect sealed fit. allot less hassle and mess then the silicone job.

kc