From my understanding, it voids the warranty on both the grout and the tile. Before you decide, get a golf ball and bounce it on every tile. You're bound to hear one or two dead spots but shouldn't hear too many. Warranty department will not replace the dead ones but you are at risk for them to crack sooner than later. They will replace cracked ones in the first year but not if you've sealed the grout. At least you'll be better able to make an informed decision.
BTW -- Easy way to clean grout -- get a good grout cleaner (Lowe's has one in a blue bottle, can't remember the name of it, sorry) and a Magic Eraser. Spray the cleaner, wipe it off, use the Eraser to finish clean up. Grout looks good as new and I've yet to find a stain it doesn't get out (including a berry stain left on for over 2 weeks by renters).
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Army/embassy brat - traveled too much to mention
Moved here from SF Bay Area (East Bay)
"There are only two ways to live your life: One is as though nothing is a miracle; the other is as though everything is a miracle." Albert Einstein
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