Spray-on Grout Sealer

The other day at HD, I saw some spray-on grout sealer. It said on the can to spray on the grout and whatever lands on the tile evaporates. $10 for 500 LF. Not a bad price if this stuff works. Has anyone used it before?
Todd
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Todd writes:

Sounds like boob bait.
Ask for the MSDS at the service counter.
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