New, damp molds should be sealed with wax before applying GM Foam Mold
release. An effective wax sealer can be made using Johnson’s Paste Wax (or any carnauba wax) that has been thinned with 99 percent isopropyl alcohol. We use a ration of 4 parts alcohol to 1 part wax.
Liquid latex and other ingredients are weighed and placed in a mixer bowl. The foam is now whipped at high speed, until it rises like whipped cream. When the desired height is reached, the mixer speed is turned down, and the foam is refined to make the bubbles or cells smaller. This also allows the ammonia content of the foam to decrease. At just the right time, gelling agent is added to the slow-turning mixer. After about two minutes of slow blending, the mixer is turned off, and the foam is poured into the negative mold. The positive is carefully placed on top of the negative.
Now pressure is applied to squeeze the two mold pieces together. With small molds, simply pressing with the hands will suffice. Larger molds require mold straps to create a good pressing action. Often the negative requires a wooden board to be placed on it and then be strapped. This increases the leverage of the strap, and gives a greater squeezing action.