I am trying to cast parts in order to scratch mold my own buildings and
> structures. Currently I am using a urethane liquid plastic to make my parts
> but I cannot find a glue or epoxy that will bind the parts together. Can
> someone please suggest a glue that will work with urethane or a different
> liquid plastic that will perform better with glue.
Hmm... I used resins from Alumilite and Smooth-On and I have no problem gluing the resin parts using CA or epoxy glues. I get very strong bonds. Make sure to remove any mold release coating before gluing the parts.
Peteski