Can you grout over new grout?

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If you want to be sure, yes, you have to dig all the grout out first. Grout bonds mostly to the tiles, less so to itself. Typically grout takes a few weeks to fully cure, but is ready to seal after 2 or 3 days. That says to me that you might still get the new grout to bond to the old. Nov 5, 2011
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