[Jewelry making - Article 01159] - Re: [Orchid] Debubblizing RTV mould compound

[frank goss]

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    Russell, mix the two parts in a container with a volume 3to 5 times
    larger than the volume of the mixture. Place it under the vacuum
    dome and vacuum until the volume collapses fully after expansion.
    Then carefully pour into the mold frame until the model is covered.
    Again vacuum until the expansion collapses fully then add another 1/2
    to 1" of material to top off the frame. 

    You can use brushed on contact coat(use a soft bristle brush) on the
    model and eliminate the vacuum if you do not have one. The body of
    the mold will have tiny bubbles throughout and it will loose some of
    its strength but the brushed on contact coat should eliminate bubbles
    on the surface of the model. Brush on a thin coat of mixed mold
    material to completely cover the model and work out any air bubbles
    that might be on the surface or trapped in model detail. Then fill
    your mold frame with the rest of your material. The big thing with
    RTV silicone is to make sure you have NO oils on the surface of the
    model or mold frame...and make sure your mixture is measure
    accurately..that is the basics. 

Luck
Frank Goss
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