quarry tiles

[Guest]

I have recently laid quarry tiles and my tiler sealed them twice [before grouting and after].I have since sealed them on two occasions with the same sealer [Lithofin slate seal]but it seems to wear off very quickly. This has happened in the last six months.They have got very dirty looking and mark easily.What have we done wrong?

[Guest]

Sounds like there's a touch to much moisture arising here, use waterproff pva, to seal them, a 4 to 1 mix will do it, when its dry, re seal with your slate seal