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grumpygrouter
I think the problem he had Dave was that he didn't premix the GT1 with water. he added it neat to the grout and then "topped up" with water. I think that was the mistake he was referring to.You can stop laughing lads......:huh2:...
You do actually add GT1 to micro colour grout for timber floors and ufh etc........now if it was micro-flex then fair enough....
Micro colour is suitable for porcelain but needs GT1 for other applications.......
So in fact Oli did right...just must have over done the GT1 bit...