I made a two part mold of a die makers hammer that was my grandfathers. My question is how do you get your clay so smooth building up around the master? I got mine reasonably smooth, but the silicon (Smooth-On OOMOO25) had clay stuck in it when I de-molded (see attached photo). I was able to wash most of the clay out but it was a pain! Cast parts came out just fine.
What is the secret?