Unglazed tiles should be sealed with liquid tile sealant during the installation process, even if you want them to retain their flat look (sealants come in gloss and non-gloss finishes, just like paint).
How do you seal unglazed porcelain tiles?
Basic Steps To Sealing Tiles
- Clean the entire tiled area prior to sealing.
- Apply the first coat of the sealant (if required).
- Grout the tiles and leave to cure properly (check the manufacturer's advice for how long to leave the grout for).
- Apply the final coat of sealant ensuring it is spread evenly – leave to dry.
How do I know if my tiles need to be sealed?
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.
