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 opened the mold after an hour at room temp.
I did a previous test the day before, on that occaision the resin had began to cure within minutes of being mixed, and I was unable to finish pouring it before it had begun to cure.
I weigh the resin in two seperate containers to make sure I get the 50/50 solution, before mixing them together.