Had a problem with shower tile grout crumbling and had to redo the grout. I did as the instructions said on the pre-mixed grout and removed 1/16" grout from all grout lines (in most cases I removed all grout). I then applied the new grout. Problem is, after 1.5 days I have some soft grout. What gives?? Do I need to remove this soft grout and replace it or will it harden? Why did it do this? Thanks in advance.
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