charcoal grout/flint tiles

[newplumb]

Hi all,

I've just tiled a wall with Pilkington's dark grey/black "smooth stone flint" tiles 100x100. They are going to be grouted with charcoal grout, but I just have a couple of questions.

1) Do you think these tiles should be sealed before grouting? (I think they are ceramic with some sort of flint-like surface finish. They don't look porous to me.)

2) Anybody got any tips on how to keep charcoal grout looking dark and stop it developing a lighter grey haze?

Thanks in advance

[James Spelrem]

1 if they are non porus no need to seal
2 keep your grought stiff dont over water and dont over wash use a petrolum based sealer not latex latex turns white petrol turns a clearto yellow.use sparling.