Making rubber molds

Tools, Techniques, and Reference Materials Techniques
1

Hi folks!

From time to time I make silicon rubber molds to duplicate parts. Either wooden masters for a scratch built or to replace a missing part, As many of us do I hold the “master” in modeling clay while pouring the rubber. The clay can be hard to use unless you really work it. I had a thought, did anyone try “kinetic sand” to hold the master while pouring the rubber? Thought I’d ask before investing time and money.

Thanks !

2

I use modeling clay, and never heard of kinetic sand before. Reading up on it now, I wouldn’t bother with it. It sounds like it’d be more effort to work with than modeling clay. But that’s just my opinion.