Glass bed modeling clay

I steal my kids playdo. It's always laying around somewhere and works just as well as any Clay I've tried. And for release agent I use Kiwi Neutral shoe polish when I have it and turtle wax car polish when I can't find my shoe polish. And I use JB weld as the bedding compound.
I used turtle wax once and when I pulled my barreled action I had a lot f rust on my metal. It ate right through the bluing.
 
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