Use an impregnating sealer.
Applying sealer to marble tile pre grout.
To protect your tile properly seal it a second time after the grout cures.
The spray on variety is the most common although some types can be applied with a sponge or brush.
Then wipe off all excess until completely dry.
Apply your sealer to the lines and joints of the grout.
Apply the sealer to the carrara marble tile and grout by creating a film of sealer.
The process for sealing a marble floor is relatively easy and should take less than an hour with each application.
Sealing the tile before grouting doesn t get you out of sealing it after grouting though.
Then wait 3 days minimum after grouting giving time for grout to cure and then seal the grout.
If your tile is not glazed be extremely cautious when applying the sealant as it will absorb directly into the tile and will change the color and finish of the piece.
I would seal the tile before grouting.
Step 3 application.
For the walls you ll have to spray on the sealer and wipe around with a paint brush or sponge to keep the tile and grout wet with sealer long enough to soak in.
Let it soak in for 2 5 minutes.
Then grout using non sanded grout.
Unlike a ceramic or porcelain tile floor it s not just the grout lines where sealing is critical but the entire surface.