grout that doesn't require misting to cure?

According to a tiling book sold by home depot, there are grouts with latex additives that does not require keeping them damp for 3 days to cure. However, all the grout that home depot sells require keeping damp to cure.
Does anyone know brand and/or stores that sell grout that cure without having to be misted? Is there any weakness in this type of grout, or else why would home depot not carry them?
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they all cure, just water makes it better. How many contractors come back to mist ? Its you job.
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