RE: micro balloons
I found that Super Fil sands almost as easy as balsa, [link]http://www.stits.com/store/msc.html[/link], $20 for a quart is hard to beat. Never tried wood glue however, if I would I beleive I would use white Elmer's rather than Titebond. The yellow colored glues seems to be more rubbery than the whites.