I learned a few things...
- A citric acid bath may be the best way to prep an iron mold for casting. I have an iron .38 RN Lyman mold that was given to me... badly deteriorated. It's been rusty, cavities black and pitted. I decided to use it to make a handful of soft lead slugs for slugging bores. This morning I scrubbed it good in hot soppy water, rinsed and tossed in a citric acid bath... ½ hour later I scrubbed it again in soppy water. I continued alternating between citric acid and scrubbing in soapy water until my toothbrush stopped turning black during scrubbing. The first boolit out of the mold was completely filled out and fell from the mold from it's own weight. I find that really interesting... further testing is in order.
- It's completely understandable to be excited about using a new mold... however...
No matter how much you prep it, and pre-heat it, if your alloy is not up to temperature it will not throw good boolits (I don't use a thermometer).- Synthetic two-cycle oil is 100-times better than Anti-Seize as a mold lube. And it don't take very much... the tiny bottle I purchased may supply my grand-kids with mold lube.
- Spending a bit extra on a mold is well worth it... period.
- Even if your shop feels a bit cool... if you're wearing wool long underwear, starting the wood stove will make you sweat horribly standing over a hot pot with a ladle.
- No matter how fatigued you get, it's really hard to take a break and refill the pot when the mold is running like a finely tuned machine.
- And when the mold is running in such a way, you're wife will never understand why you won't stop to talk to her when she comes to the shop asking questions.
It was a good day.
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