[Jewelry making - Article 01175] - Re: [Orchid] Debubblizing RTV mould compound

[frankenstein58]

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    Hi; you will need to make your frame as tall as possible because when
    you mix it you will introduce alot of air that will need to be
    "de-aired" and it will raise at that point you will have to release
    the vacuum pressure so it doesn't overflow like you do with
    investment. but if you have a taller mold frame it will require less
    up and down pressure releasing, usually after about 12 to 15 minutes
    is enough for most jewelry items in standard frames. Don't try to get
    every bubble out becuse there will always be some that will be there,
    however they will be super tiny once you take the vac pressure off
    that they won't even be noticeable. so let it go up and down with
    pressure releases until it won't over flow any more the let it go an
    additional ten minutes and you will be fine, Also it is possible to
    over vacuum, so long that the RTV starts to set up while under
    pressure, and that is not good, remember once you mix in the catalyst
    the clock is ticking and you want to get it into the vac as soon as
    you can because the RTV will be the thinnest and easiest to de-air at
    that point. you be fine...
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