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HSMITH · January 9, 2006, 09:26 AM

Chlorinated brake cleaner will clean a mold out in seconds, saves the boiling time.

What you describe sounds like oil in the mold AND low temps to be. The low temp part could be the melt, the mold or both.

I cast hot and fast, 725-750* or so in the pot, and keep the bullets coming from the mold just a tad 'frosted'.

Get your pot temp up if needed, then pour and dump the bullets FAST, as soon as the sprue hardens dump and refill. Keep doing that until the bullets look like they have a layer of frost on them or a slightly dull look. You have now gone too fast and gotten the mold too hot, slow down some now. Cast and dump just fast enough to stay on the edge of frosty bullets. A mold that is a little on the hot side casts better than one that is a little on the cold side.

January 9, 2006, 09:26 AM	#5
HSMITH Senior Member Join Date: June 21, 2002 Posts: 2,019	Chlorinated brake cleaner will clean a mold out in seconds, saves the boiling time. What you describe sounds like oil in the mold AND low temps to be. The low temp part could be the melt, the mold or both. I cast hot and fast, 725-750* or so in the pot, and keep the bullets coming from the mold just a tad 'frosted'. Get your pot temp up if needed, then pour and dump the bullets FAST, as soon as the sprue hardens dump and refill. Keep doing that until the bullets look like they have a layer of frost on them or a slightly dull look. You have now gone too fast and gotten the mold too hot, slow down some now. Cast and dump just fast enough to stay on the edge of frosty bullets. A mold that is a little on the hot side casts better than one that is a little on the cold side.