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I've just created my first silicone mould, well, the first part of a two part mould.

I've used OOmOO 30, which is great.

However, I've used a modelling clay called Sculpey III to raise parts in the first half of the mould.

The silicone has cured, and I've attempted to remove the clay, but it's just stuck to the plastic parts and the mould.

Any suggestions on cleaning? Or a better clay?

  • So I used clay to raise parts in a 2 part mold. These were plastic Nintendo Gameboy Color buttons. – Phil Collins Apr 10 at 13:50
  • It was just to rise the buttons off the base of my mold box, then to be removed when I started the second half of the mold – Phil Collins Apr 10 at 13:58
  • posting as a comment because I don't know for sure (couldn't quickly find an answer, I'll look again later), but try a solvent like (strong) rubbing/isopropyl alcohol to remove it, and don't use it again. Polymer clays tend to partially melt plastics--the plasticizers in them break down hard plastics like your buttons. – Allison C Apr 10 at 15:19
  • Thanks! That's helpful, any suggestions on a good clay to use? – Phil Collins Apr 10 at 15:21
  • it's been a very long time since I've made a silicone (selastic) mold, but iirc, I used plasticene (non-drying modeling clay) to create the registration "bumps" and pour spout when making the first half, and it removed cleanly from the mold material. I can't speak for plastic, as I was molding from a silver piece. – Allison C Apr 10 at 18:29

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