The type of stone, tile and grout that you have will determine if sealing is necessary. Glazed ceramic and porcelain tiles have almost no porosity and are highly resistant to staining; therefore, sealing is not required. However, it is beneficial to seal unglazed, polished porcelain floor tile. If either the tile or grout is considered porous, such as natural-stone tile, terra cotta, Saltillo, brick or cement-based grout, sealing is recommended.
Although not required, for optimal results, Ultracolor Plus FA or Ultracolor Plus Max may be sealed - especially in places such as showers. Sealers make grout maintenance easier in the long run. The solution: UltraCareGrout Sealer.