[Jewelry making - Article 00152] - Re: [Orchid] Mold making on the cheap

[Veronica Kubat]

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    I use RTV on one-part molds and that is how I prevent bubbles. I get
    an old children's paint brush (Crayola or the like) and paint a
    layer over the surface, the pour the RTV over to fill the cavity. I
    have heard the opinion that if you are using a two-part mold, there
    might be an issue with bubbles in the balance of the mold causing
    some sort of problem because of porosity. It seems to me if you paint
    a piece with RTV, then have to set it in a two-part mold and pour the
    rest, the problem would be the layer on the piece curing before you
    get the rest in the mold and it not adhering and splitting away when
    you cut the mold. I don't know if that is an issure or not. But check
    into that. 

V.
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