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Pour stain into an 8-ounce spray bottle and spray onto the tiles. Use a clean lint-free rag to evenly blend the stain into the tiles. Leave the stain to dry for at least 1 hour. Spray two coats of sealer onto the entire tiled area an let the tile dry for at least 24 hours.
In most cases, however, it is not the slate that will stain, but the grout between individual tiles. How you clean that grout depends on whether it is colored or non-colored. A sealer can keep floors cleaner. For colored grout, always test cleaners in an inconspicuous area before using them on the stain.n most cases, however, it is not the slate that will stain, but the grout between individual tiles. How you clean that grout depends on whether it is colored or non-colored. A sealer can keep floors cleaner. For colored grout, always test cleaners in an inconspicuous area before using them on the stain.