The tutorial for this clever (and punny) take on thumbtacks uses a molding agent and plaster of paris but it occurs to me this would work just fine with a molding agent like Amazing Mold Putty and some form of air dry clay. I say air dry so that you could push a commercial, plastic ended thumbtack into the clay in the mold, just as in the tutorial but if you wanted to use polymer clay, you’d simply get the metal thumbtacks so that you could bake the mold pulls.
If you wanted to make EVERYONE thumb shaped thumbtacks though… plaster is the way to go. It’s economical.
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