Take out of the freezer strictly the material that will be used in a short time, leaving the rest of the package at controlled temperature. Do not remove the polyethylene protecting the rubber until it is completely thaw. This way moisture condensation will form on the polyethylene of the packaging and not on the rubber, which will remain protected. When the rubber has reached room temperature you can remove the polyethylene sheet. CER01 compound is damaged by humidity: protecting it during use allows to avoid the formation of bubbles on the surface of the coating.