MCK-Y the Lego Mouse Droid Build

[Ziz]

Exactly - cut the foam off after it cures. A lot of model guys use foam to reinforce vacuform model kits and that's exactly what they do - fill the part expecting the foam to overflow a little then trim/sand after it's solid.

Also, guys have learned to work sparingly - put in a little foam, let it expand and cure, then come back and add more. Don't try to fill the whole thing on the first shot.