ORIGINAL: Colin Wavell
I have made a wiper to cover the hinge gap using acetate sheet...the kind used for making animation cells. Cut a strip the exact length of the aileron and about 1/2-3/4 inch wide then stick double sided tape along its length but only covering half the width of it. If you can manage to score it to give a slight V shape or curve along the length so much the better. Stick it to the sub trailing edge and it will cover the gap and wipe against the aileron or flap as it moves. Its tricky to get it to work right but possible.
Excellent suggestion. I was going to mention drafting mylar which will do the same thing. Actually, if it's going over a painted or opaque surface, the frosted side will take paint very well to match the wing/surface.
bob