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Old April 1, 2013, 07:57 PM   #2
Senior Member
Join Date: February 28, 2012
Location: South Dakota
Posts: 224
I think you have part of that backwards.

I have read that after 20 days it will loss about 4 bhn for a hardness of 7-8 is this correct or is it harder when just cast?
Usually the longer it sets the harder it gets. I've read water quenched takes a longer time to harden, but hardens more so then air cooled.

Not sure on the BHN. Tin is expensive and I'd almost start with a 1:20 mix or more.

You never mentioned what you are casting for. It can make a difference.
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