how to seal slate tile

Sealing slate floor tiles will keep them from staining and cracking. Though most installers don't seal slate tile, it's easy enough to do at home. It will keep the tile free from needing repairs or replacements for many years. It can also give slate tile a new look, depending on the type of sealant that's used.
 
Steps
 
1Step One
Choose a finish for your sealant. Pick between a glossy finish or a matte seal. Pick either a penetrating sealant that will create a stronger seal or a topical one that coats only the surface. Choose a water-based sealant if you are worried about the level of toxic fumes.
 
2Step Two
Purchase the tile sealant from a home improvement or hardware store.
 
3Step Three
Allow the mortar to dry before grouting the slate tile. Add your chosen sealant into the grout mixture for extra water resistance.
 
4Step Four
Allow the grouted tile 1 week to dry. Clean the tile a few times to ensure that any remnants from the grout are washed away and will not affect the texture of the tile.
 
5Step Five
Allow the tile to dry thoroughly after it has been washed.
 
6Step Six
Follow the grain of the tile when applying the sealant. Make sure to apply it in an even coat, with no streaking or puddles left behind. Ventilate the area as much as possible, since most sealers give off toxic fumes.

7Step Seven
Allow the tile sealant to dry on the slate for about 2 hours. Apply a second coat of sealant and allow it 2 hours to dry before walking on the tile or putting furniture on it.