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.

Hi Warren

The residue in my pouring container didn't harden either. I suspect the resin was badly mixed, in that Part A probably wasn't shaken. I don't know how big a difference that might make but in all the containers I bought from Easy Composities, the Part A appears to be seperated into a thick residue at the bottom, and a thin liquid on top. I did two tests prior to my casting efforts. The first ended up much as this cast has done, a thick honey like sludge. The second, when I shook the Part A for a longer period of time, cured very rapidly.

My first cast attempt was also a failure as the resin cured so fast, I never managed to get more than 10% of my mold filled (this is my first ever mold).

I've clean the mold now, using acetone as advised, and it appears to have worked. I'll try for a third time (when my children aren't taking up all my time) and post the results.

It seems like it is a big part to cast... The reason why it cures so fast is that you probably make big batches of resin at the time...