Use polymer clay
it's really tough. I made some cthulhu-related stuff out of normal clay a while back but the paint just chips off
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0800221155 Coldseal windows,
Thu 5 Jul 2007, 17:46,
archived)
Been wanting to try that for a while
This china-style clay retains the paint pretty well, as long as I don't mind a matte finish.
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Caustic Armadillo consists at least 30% out of custard,
Thu 5 Jul 2007, 17:50,
archived)