All natural stone tiles polished shiny honed matte or tumbled antiqued are porous therefore sealing before grouting is essential to fill these pores with protective sealer.
Sealing polished marble tile before grouting.
This is done because typical grouting involves packing the grout into the joints by smearing it over all or part of the material face.
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.
Countertop specialty comment.
I would seal the tile before grouting.
Before you consider sealing your tile keep in mind that there is marble that does not need to be sealed.
Polished marble shouldn t need sealing before you apply grout but tumbled marble does it s so absorbent that the grout itself will stain it during the installation process unless you seal it.
Then grout using non sanded grout.
Then i used a grouting sponge to wipe off any excess.
You can apply another coat of sealer on the tile too.
This must be removed but careful what you use.
If you are unsure which marble you have.
Coverage grout grouting liquid marble not paint seal sealing tile tile grout tiling discuss issues with not sealing marble before grouting.
If this is not done minute particles of grout will sit in the pores and result in a hazy surface appearance.
After grouting the tile looks dull.
Pre sealing is sealing the floor or wall surfacing material before it has been grouted.
I used this sealer and just put it in a spray bottle and sprayed three coats on the ungrouted tile.
Then wait 3 days minimum after grouting giving time for grout to cure and then seal the grout.
Marble sometimes gets circulary etches scrathed into its polished face with sanded grout.
Most grout haze removers will etch marble.
Do you polish the marble before sealing.
This is usually polished marble installed as larger slabs and not as individually cut tiles.