This weekend I juse set and grouted filled honed travertine floor tile. I sleaed most of it about 12 hours before I grouted. However, about the last 20 tiles were laid in the mornging of the day I grouted. Frankly I did not see any difference in cleaning the grout off the sealed vs. unsealed tiles. I will seal, grout and all, in a few days.

If you're DIYing this, I'd strongly suggest that you seal the tile prior to grouting. If you're having a pro come in and do it, I'd leave it to his discretion. Some prefer to grout raw tile, while others will prefer to seal it first. I know myself, I prefer to grout it raw.

Thanks all