Sealing grout with penetrating sealer, not membrane forming sealer used in grout colorant. After the grout sealer has set, water should bead off it as though it had been waxed. If not, apply another coat of sealant.
How to Seal Grout. Penetrating grout sealers help prevent staining and prevent grease from seeping into the grout, while other non-penetrating grout sealers form a barrier to protect the grout from water and stains.
Color Sealing Grout
Color sealing grout is a great way to change the color of your grout, make it look new or darken it up