STAIN-PROOF^® Dense Stone Impregnating Sealer, formerly known as STAIN-PROOF Plus™, is an impregnating, invisible and breathable sealer that protects natural stone countertops from damage caused by water, salts and oil-based stains. Treated countertop surfaces become easier to clean, maintain, and keep looking good for longer. Dense Stone Impregnating Sealer provides lasting protection for natural stone that comes with a 25 year warranty*. 16oz