you will be looking for a grout that is classed/named as a SUPERFINE grout,these will have an admixture already in it..
i would be using this grout on ..glass mosiac/polished marble..etc..so as you dont scratch the surface off the tile...but you can still use a procative sealer on the tiles as well, proir to grouting.
mapei/weber do these,bal its their microflex range..
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