Sealing is done to strengthen tile or grout's defenses against dirt, spills, and erosion of grout, but not all tile needs to be sealed.
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.
You can sometimes tell if your tile or grout have been sealed by spreading a few drops of water on them. If they darken or change color, they are probably not sealed. If they stay the same, they may have already been sealed.
It's always a good idea to follow your manufacturer's instructions on a schedule for sealing grout and tile.
Features + Benefits
Sealing of grout and porous tiles (such as terracotta, marble,
polished porcelain, granite, travertine, limestone & sand - stone etc)
is necessary to protect them from premature decay and contamination.
Even old tiles and grout can be cleaned and resealed to give them back
a new lease on life!Sealing your porous tiles and grout provides reaction time to deal with spills. An unsealed floor can stain immediately, whereas a sealed floor is stain resistant with a reaction time of up to 4-5 hours.
