RE: material to seal control surface gaps
Good point, Ken.. about sealing both sides. It really isn't that much more work, only a few minutes more, and it's done.
I didn't realize the difference sealing the gaps made until I did it. Rolls are much more crisp and precise as are turns and any other maneuver requiring ailerons. The pattern guys (mainly Ron and Dave Lockhart) got me to do mine.
Dick.