STAIN-PROOF® Porcelain & Quartz Sealer, formerly known as PORCELAIN PLUS™, is a premium, impregnating sealer specifically designed for porcelain and quartz surfaces. Porcelain & Quartz Sealer features nano size sealing molecules that will seal the micro pores in polished porcelains and quartz surfaces. This new technology has been developed specifically for surfaces with low absorption rates in an easy to use, non-film forming sealer.