Clean the tiles well using hot water and detergent. Ensure all dirt and oil are removed from the tiles as well as the grout. Let the tiles dry completely.
Pour the sealer into a bucket and dip the mop in. Apply the sealer to the tile floor in short and even strokes. Start in the corner of the tile area, and when it is time to re-wet the mop, pick up where you left off.
Work on the farthest point on the tile and move toward the area closest to the door. Avoid boxing yourself into a corner and having to step on the sealant to get out.
Allow the first coat of sealer to dry completely, according to the directions on the package. Place fans nearby to speed up the drying process if desired. Open windows throughout the house to increase circulation.
Apply another coat of sealant after the first one dries, if the manufacturer's instructions say so. Allow a second coat to dry completely, anywhere from 24 to 48 hours, depending on the manufacturer's instructions.