Can You Color Seal Grout That Has Already Been Sealed?
Yes, in many cases you can color seal grout that has already been sealed, but there is one important catch: the existing sealer cannot prevent the new color sealer from properly bonding with the grout. This is where homeowners sometimes run into trouble. They see stained, uneven, or outdated grout, buy a color sealer, and assume they can simply paint it over whatever is already there. Sometimes that works. Sometimes the previous sealer is still doing its job a little too well and creates a barrier between the grout and the new product.
The good news is that previously sealed grout does not automatically mean you need to regrout or replace anything. It usually means the grout needs to be properly prepared first.
Why Does the Existing Grout Sealer Matter?
Traditional clear grout sealers are designed to reduce the amount of moisture, dirt, and staining that can penetrate porous grout. That is great when you are trying to protect grout, but it can become a problem when you later want to apply a penetrating color sealer. Grout Shield Color Seal is designed to revitalize or change the color of existing grout while sealing it at the same time. Unlike simply painting the surface, the product is designed to work with the grout itself and form a protective barrier over existing sanded or unsanded grout.