thanks guys, I knew it had to be a moisture problem, I just didn't see how this could have happened in 24 hours in room temperature...also, I had been told and read on more than one occasion to add oil to the master to help it pull out of the mold easier but if this is going to potentially cause defects I will not try this anymore...also travis, the mold happened before I took the two pieces apart for the first time...I poured the 2nd piece one night and when I got home the next evening and took them apart it had mold all inside, especially around the master which in this case was oven bake clay.