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Mold Max 30, no vacuum chamber
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Re: Mold Max 30, no vacuum chamber
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Kovax
Re: Mold Max 30, no vacuum chamber
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Nov 24 07 9:26 AM
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You COULD use MoldMax 30 for your first attempt, but I was fairly glad that I started out with an easier material (OOMOO 30). The first pour is always a traumatic experience. After that it generally goes fairly well, but you certainly don't need a lot of extra things to worry about on that first shot. With care, you can still get a perfect mold without using a vacuum chamber, it's just not as easy.
To minimize trapped air, stir with a rounded stirring rod, and try not to lay the RTV back over on itself while stirring, which will result in air pockets being created. Make sure the RTV is COMPLETELY mixed, if you still see color variations, its not done.
Pouring from higher up will give any air in the mix a chance to work itself out before it ends up in your mold form. Pouring into a small empty spot in the mold, and allowing the RTV to rise gradually over the parts, also reduces the number of bubbles which stick directly to the pieces. Those bubbles in the middle of the mix will tend to rise out on their own; pre-painting a layer of RTV onto the parts serves the same purpose.
Painting the parts with either a commercial sealer (rather than a mold release), floor wax, laquer, or dissolved bar soap/liquid hand soap (not liquid detergent), will prevent the RTV from sticking to your masters. Depending on what the masters are made of, this may not be absolutely necessary, but I've learned the hard way what happens when the RTV sticks to them, and it isn't pretty.
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Mold Max 30, no vacuum chamber
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