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Customizing Tips and Tricks / Re: First successful helmet casts! Yay me!
« on: November 7, 2006, 03:32 PM »
I use the pot for both the molds and for the casts. That way the mold doesn't have any air bubbles, and produces better castings.
I keep the pot pressurized for about 30 minutes. I don't really time it. I just put the mold box or mold in, pressurize it to 40 psi, and walk away. For the plastic and rubber that I use, 30 minutes is more than enough time. Once it's started curing solid, there's no point in keeping it pressurized, because the air bubbles can no longer move.
I keep the pot pressurized for about 30 minutes. I don't really time it. I just put the mold box or mold in, pressurize it to 40 psi, and walk away. For the plastic and rubber that I use, 30 minutes is more than enough time. Once it's started curing solid, there's no point in keeping it pressurized, because the air bubbles can no longer move.