[Jewelry making - Article 00053] - [Orchid] Cement-like gunk on castings

[Peggy E. Pollak, Ph.D.]

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    Please help. I've been casting for about seven years with someone
    else's oxy-acetylene set up with absolutely no problems and finally,
    this summer, got my own centrifugal casting set up. I opted for an
    oxy-propane torch since I was told it is cleaner. I've had nothing
    but problems since, most of which I will not bore you with, but now
    I use distilled water, with no change in the investment, waxes, or
    burn-out cycle. Recently I started to get these cement-like deposits
    all over my castings. It polishes out pretty easily with a 120 grit
    wheel but I lose alot of fine detail. Any ideas? 

Thanks.
Peg
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