I just used Elmer's brand foam board to build a FT Racer and had a much better experience than the Adam's foam board. The Elmer's only cost $1.50 per sheet and it does not have to be treated to paint, almost water proof, paper backing does not peel(better hinges), does not tear when cut with a dull knife and much stronger than the Adam's board. It may not be as forgiving for newbies in crashes but should fold wings at high speed.