Non toxic wood sealer: SEAL SMARTER. Breathe Easy Stain Block Technology. Powerful Professional Formula Without Toxic Fumes. Protect Grout, Marble, Ceramic, Mosaic, Stone, Granite & More. NON-TOXIC. Zero VOC, Water Based, Plant Based Surfactants, No PFOAS, No Flurochemicals, ZERO Toxic SolventsSTAIN BLOCK. No More Ugly Black Shower Stains, Food Stains In The Kitchen Or Dirt Stains In The Laundry Room. Blocks All Stain Types From Penetrating. EASY TO USE. Convenient Spray Bottle Means You Don't Have To Get On Your Hands And Knees To Apply To Grout & Tile.