[Jewelry making - Article 00109] - Re: [Orchid] Cement-like gunk on castings

[Ken Ferrell]

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Peg;

>     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? 

    It sounds like your investment is breaking down, possibly due to
    age, Some time when investment has become stale I(for lack of a
    better term you can get spaulling at least that's what I was told it
    is called. You can also develop finned castings, this usually happens
    when the investment has absorbed moisture investment has a short
    shelf life in humid areas. I personally don't like Propane /Oxy
    torches due to their lack of temperature, it is cleaner burning but a
    rich Oxy/Acetylene mixture is hotter and can also dissipate or burn
    off excess oxygen giving less porosity resulting in less waste Hope I
    have been of some help, R&R Ransom & Randolph have a good trouble
    shooting area on their web site, I think Kerr does as well. 

Kenneth Ferrell
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