Grey Mapei grout gone patchy

[Gazzer]

I think it gave good results and saved a lot of time.

PS the original grout wasnt Mapei and damage was caused by flooding.

 

[DukeofYork]

What brand of grout colourant would you recommend?

This is how it looks. It's supposed to be dark grey (I think off the top of my head we got Medium Grey 112) but its nowhere near the sample

 

[Gazzer]

I would use Universeal, click the link Tradetiler Universeal Grout Colour