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This filler was designed for use as a thickener/filler for latex rubber when making rubber molds. It's used where you might want to simplify the exterior shape of your rubber mold or eliminate small undercuts so that your mother mold might need to be fewer pieces. To use, simply add to your latex to make a paste and apply to the rubber mold in layers no thicker than 1/4". When the undercut is filled to your satisfaction, seal with a couple of coats of latex and proceed to making your mother mold.