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I have just got an aluminium mold from MP Mold. I blackened it with a cigarette lighter before use. Do I need to wash away the carbon coating after use and blacken it again the next time ?
I've always used a candle because in addition to the soot some vaporized paraffin or wax is deposited on the molds. The reason you do this is that it acts as a release agent for the pellet/bullet. You do not need to see a black coating on the molds, just a slight haze. Be sure not to plug up the fine engraved lines inside the face of the mold blocks as this lets the air escape to get well filled out pellets.