A successful, long-lasting job, however, requires structurally intact grout. Paint wont adhere well to fraying or crumbling grout—and if you try to paint damaged grout, its condition will continue to worsen after painting. If your grout is in truly bad shape, re-grouting the tile is a better option.

Beside above, how long does grout colorant last? fifteen years

Herein, can grout be painted or stained?

Grout colorants serve to seal and color grout and protect it from becoming stained again. Only ceramic and porcelain tile floors can be painted with a grout colorant. Porous stone tiles will absorb the grout colorant and become stained with the grout colorant.

Can I paint grout with regular paint?

Painting a grout tile line requires paint specifically made for grout. Its more of an epoxy colorant than a traditional paint, and once cured, it will last for many years. Regular wall paints are not intended for use on grout and tend to peel off or not adhere at all.