I
Ian
I use Ultra colour all the time.. and do not have any issues... it IS!! user error.. you are washing off to early and leaving to much water in the joint... polymer leaching is very common with heavily modified grouts and until you use them properly then you will always get this shading..
Don't want to upset readers etc but IMHO it is user error when cleaning down.. but if another make works for you , then even better but you cannot simply blame a grout when the product is fine...
Just my opinion as to why some folk have issues with this grout.. not digs or cyber bullying.. just how i see it.
Do you not think it is too sensitive Dave? I know lots on here rate it highly, but there do seem to be a lot of issues with it.