Because marble is a natural stone and will absorb color you need to seal them before you grout to prevent the grout from discoloring the tile.
Marble trim seal or caulk first.
I used this sealer and just put it in a spray bottle and sprayed three coats on the ungrouted tile.
Caulk can be either sanded or unsanded.
Unsanded caulk has a smooth appearance and texture.
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You ll find you have to gently.
Sanded caulk has particles in it that help it adhere to wet surfaces and expand in larger gaps without cracking.
Use sanded caulk any time you use sanded grout and in joints 1 8 inch or wider.
Doing so will give the mold opportunity to extend further and break the bonding of the older from new caulk.
It has a grainy texture and appearance.
Hold the caulk gun at a 45 degree angle and do a few practice runs on a piece of paper first to get a feel for how much pressure to apply.
Then i used a grouting sponge to wipe off any excess.