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Hello, awbrock. Since there is a chance I might not use that particular mould again for awhile..after casting, while mould is still hot, I clean off all lead deposits, etc. Then while still warm..being able to hand hold metal parts.. I spray with an industrial product called Mold Saver..has lanolin in it..I like to keep halves open to allow product to dry overnight..I know they will be just as I last used them. Clean up for re-use is simple using brake cleaner & a hot soapy water bath..lately I have been just using the hot soapy water.
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