[firehawkmph]

I haven’t used this particular grout. But researching it, if properly mixed and applied, it would work for the floor shown here. It’s made to fill joints from 1/16”- 3/4”, but it is a fast setting grout. I’m thinking they either added too much water at the beginning, or more likely added water when the grout started to thicken up. When they went to redo it, if they didn’t remove all the old grout, the new grout is not going to work. I don’t believe the grout was defective, I’m going more with improper application.
Mike Hawkins

 

[firehawkmph]

My buddy said he was there when the owner came to do it. Then when he did his own test, he said he meticulously followed the instructions. Would not removing ALL of an improperly mixed grout already in the joints make the new stuff not work?

He should have removed all the old grout before regrouting. Especially with such a narrow joint space.
Mike Hawkins