bucket,

Unless you have a really hard piece of balsa, you probably won't need ammonia, especially for 3/32" sheet. just soak your piece in a pan of warm/hot water for 20 minutes or so, then wipe it off and try it around the formers. It should bend around just fine. If not, then soak it a litle longer. As rcPilot said, use thin CA to glue it down. This is one of those areas where CA really works better than other glues. Just don't get in a hurry and you'll get a nice job. That's another reason for using just water. With ammonia you'll WANT to hurry to get away from the smell! Good luck.

papermache