Some other good contact adhesive foam glues are:
Beacon Foam Tac - Available at places like RCFoam.com and filadelfosrc.com
Beacon 3-in-1 Advanced Craft Glue - Can be found at craft stores like Jo-Ann's, Michael's and Hobby Lobby (craft store, not RC store)
Both of these work great on all kinds of foam, and you don't have to go out and buy a 1 gallon bucket.