[Jewelry making - Article 00034] - Re: [Orchid] Debubblizing RTV mould compound

[AC]

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>     I have been using the Castaldo liquid pink RTV for most of this
>     year, and couldn't be happier! 

    Tim and all using the Castaldo pink. Yes it makes great rather
    inexpensive RTV molds, but don't count on the molds made with it to
    be around more than 2-3 years. It's a urethane derived product and
    seems to be very susceptable to post cure humidity. Your molds will
    revert to a liquid state over time and there's nothing you can do,
    except keep them sealed away from humidity, to stave off this
    change. This material seems to be a close relative of Smooth-on's 724
    and I've thrown out many, many molds over the years which were made
    before discovering the downside of using this particular material.
    There are other urethanes elastomers that are a little more costly,
    but have much greater library lives. Also, you want to make sure you
    have good ventilation if you ever do any burning to modify a mold.
    724 has mercury in the formulation and I'm pretty sure the Pink does
    too. Another tip about using it, and probably all other RTV's, is
    thoroughly, thoroughly mix both parts of the system before CAREFULLY
    weighing out required amounts. 

Frank
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