Primer advice: Casting Masters

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PetarB
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Primer advice: Casting Masters

Post by PetarB »

What kind of spray do you put on your master before you cast it? What's inert with RTV rubber?
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TER-OR
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Post by TER-OR »

I've had luck with Gunze Sangyo's Mr. Surfacer 1000.

Also, Future as a sealant for slightly porous materials is good.
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DX-SFX
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Post by DX-SFX »

Most things are inert with silicone rubber except glass/ceramic glazing and shellac. The rubber will bond to both of those if you don't use a release spray. As long as your master pattern isn't porous, it should be fine. You can use anything as a primer/sealer that you feel comfortable using apart from the above mentioned shellac.
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