A unique rust preventive formulation. designed, through a special ultra-dry spray package, to deliver a dry mist spray which will not penetrate into moving mold parts, including ejector pin holes, slides, cams, etc. This special feature prevents marking of plastic parts when molds are put back in service, where normally a conventional rust preventive may leach out of mold crevices and mark parts, resulting in lost production time and rejected parts. Mold shield's special dry mist feature prevents marking of plastic parts when molds are put back in service. Protects up to two years under normal indoor storage conditions.