I have attempted to cast a model using Easy Composites' Fast Cast Polyurethane Casting Resin. The cast failed as the resin did not fully cure. Half the model cured but the rest came out like thick honey, see image above. I'm not sure why this happened, but my immediate problem is, how do I clean the uncured resin goo from my mold? The mold is made of RTV silicone.

I think the answer is simple, he has already explained that he did not mix the separate parts before mixing them together, so he was skimming the top off a part, which cured fast, and the sludge went into the second, which hardly cured.

Get new resin, shake/stir the individual containers, and then mix correctly 50/50.

A friend mixes this on large scale, 30kg containers, and he stirs part A + B separately with a drill and stirring attachment.

cheers