*Grout Boost® is stain proof to most common household, residential stains when cleaned immediately.
** Grout Boost® is mixed with a Portland cement based grout. All Portland cement based products, including grout, have the potential for efflorescence and color shading, which is not considered a manufacturing defect. Grout Boost® doesn’t cause efflorescence. Refer to tecskillset.com/blog on proper installation techniques to help prevent grout efflorescence.