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What mix did you end up using? I've heard of guys going several melts with a portland based refractory, as long as they only melt Aluminum. The temptation do melt brass or Iron is just too great for some and then they ruin their lining.
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How long will the home brew refractories last or start to fail? I've fired my new foundry several times and I'm not seeing anything failing. Just a few cracks in the lid where the exit hole is, but it looks sound.
What mix did you end up using? I've heard of guys going several melts with a portland based refractory, as long as they only melt Aluminum. The temptation do melt brass or Iron is just too great for some and then they ruin their lining.
I just melt aluminum.
The mix
2 parts bentonite
2 parts silica sand
1 1/2 parts perlite
1 1/2 parts portland cement
1 1/2 parts firerock
Just melted a couple of old carbs tonight and the mix still not showing any signs of failing.
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