The surface of most ceramic and porcelain tile does not need to be sealed, although some require a light application of a penetrating sealer to fill the micro pores on the surface of the tile. However, the grout joint between the tiles is usually very porous and generally made of a cement-based material.
If your tile is ceramic or porcelain, it probably won’t need to be sealed. There are some exceptions to this, so check with your manufacturer to be sure. If your tile is stone (slate, marble, granite, travertine, etc.) then it will need to be sealed. Stone is naturally porous and will absorb spills and stain fairly easily.
HOW TO SEAL GROUT ON A TILE FLOOR
How To Seal Grout on a Tile Floor
How To Seal Porcelain Tiles and Grout
Frequently Asked Questions
Do you need to seal ceramic tile before grouting?
Sealing the tiles prior to setting them is the most ideal time. ... However you will absolutely need to seal porous tiles prior to grouting. Grout can and will stain a lot of tiles so protecting them from that is a must. After the grout has fully cured, which is about 3 days, a second coat of sealer should be applied.
How often should you put water on ceramic tile floor?
You can test this by placing 2-3 tablespoons of water on a tile and grout section that is in a high traffic area of the floor and waiting for five minutes. If the water sinks in or if the tile/grout changes color from absorbing some water, then the surface sealer may no longer be working. Resealing should take place no more often than once a year.