sealing porcelain

[kopthis]

hi all am laying porcelain tiles today,using a felt pen I noticed the pen would not come off the tile supplier said i should use a stone sealer before grouting to give the tiles more protection ,I have never come across this before these are top quality tiles,I thought porcelain was not porus thanks

[Dave]

It isn't that porous.. it is the surface capillaries that hold stains.. is it polished or through bodied porcelain.?

[kopthis]

it is defo polished

[Dave]

Then you need a specific penetrating sealer designed for polished surfaces ... LTP MPG sealer is a good one.. The sealing of this type of tile is just to aid in the maintenance of them..

[kopthis]

ok will do thanks

[paul78]

use seal-guard mate prior to grouting