Do Porcelain Floor Tiles Need Sealing. In fact one would hope that most porcelain does not require sealing, that was the whole point of porcelain when it was first created, well one of the the points anyway. In order to determine whether or not your particular porcelain will benefit from applying a sealer, you can perform a very simple water test. A higher rate of water absorption will require the need for sealing of your porcelain tiles.
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Mount the tile as usual, putting down a layer of thinset mortar with a notched trowel and pressing the tiles into it. Grout is naturally porous and will stain easily; If you suspect that your porcelain might need sealing there are couple of ways you can check:
Gallery of Do Porcelain Floor Tiles Need Sealing
This is a generic tech help for stone floor and grout sealing. 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. In order to determine whether or not your particular porcelain will benefit from applying a sealer, you can perform a very simple water test. You may assume that polished, unglazed tile would be less susceptible to staining than unpolished and unglazed tile.