A common question is whether you can use 5-minute epoxy to make a casting with ComposiMold.
As Bob The Builder says "yes we can."
The epoxy cast in the ComposiMold made a nice impression of this cat-and I really like the clarity of the epoxy.
5-minute epoxy works fine but keep in mind that it is designed as an adhesive, not a casting material. The viscosity is higher than what is preferable. It also comes in these little tubes that can drive you crazy. So it is nice for a quick, simple mold, but if you are going to make many molds, it's worth investing in a casting material designed for molding.
Other epoxies will work also. So experiment.