Pit Bass Posted November 24, 2003 Report Share Posted November 24, 2003 Hi guys, I'm a beginner in hand pours and I'm having trouble making original molds. I've been using plaster and Durhams water-putty to make molds from soft masters. This works ok, but creating original soft-masters is tough. Recently, I've made some hard masters using sculpey clay. I figured that a hard master would need a soft mold-medium, so I tried the silicone caulking mold. It kinda worked, but the detail level was poor. Can I use a hard master to build a hard mold like plaster or water-putty ? Thanks for any help. Alan Quote Link to comment Share on other sites More sharing options...
Senkosam Posted November 24, 2003 Report Share Posted November 24, 2003 Depends on the detail of the master-form. Simple, less detailed forms just have to be oiled up with vaseline before sitting in plaster. Clay must be dry and hard, as well as oiled, or the water in the plaster will react with it and turn it soft. But, if that happens, just pull out clay pieces to free the mold cavity. Sometimes 2 part molds are easier to work with when form parts are deeper than the main axis of the form (shad). Sam Quote Link to comment Share on other sites More sharing options...
Big Splash Posted November 24, 2003 Report Share Posted November 24, 2003 Pit Bass; You are right, unless your master is built with 'draft', ie. angled sides, the hard master will not come out of the new mold. I have had succsess using plasticene for a master, as you can dig it out in pieces if you need to. No mold release is needed for plaster a mold. Quote Link to comment Share on other sites More sharing options...
