Proper way to grout this porous mosaic?
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Our whole backsplash is the porous stone tiles. You want to grout over them and fill the holes, they will still have character and we feel the grout softens and adds to the look. You will want to use a grout color that is in the tiles. The excess grout will wipe off.
Stone sealer, either in squirt or sponge on, follow directions on bottle. Sponging on tile will prevent overspray, reducing cleanup of glass tiles. Safer(not faster), to tape off glass tiles to seal porous stone tiles. Sealer may need time to dry, over night preferred, so as not to come off with grouting.
A proper sealer, used accordingly, will prevent grout from adhering to stone tile. So do not over saturate tiles. Once grout is clean, dried, and cured, use quality sealer to prevent chipouts around stone tiles. Good luck.
This looks like a tumbled marble and glass type. I have used for kitchens. Because you have a glass tile I hope they offered you a non sanded grout, so your glass doesn't get scratched. Continue with your grout, it covers everything and fills in the holes to make a smoother finish, which is what it is meant to do. Also remember not to leave it sitting to long before using wet sponge to wash off excess grout. Grout dries fairly quickly and will leave a grey film on your glass that you will never get off. If it is a large area work in sections. Instructions on the grout box/bag should give a time limit. I hope this helps you.
Grouting and Filling Holes
If you have an rustic tile backsplash filled with large, visible holes, such as travertine, you have the option of filling these holes with grout that matches the color of the tiles. Begin by coating the tiles using an impregnating sealer -- but only coat the surface of the tiles, and avoid getting sealer into the holes. Buff away the excess after 10 minutes, then apply the grout. Cover the entire surface of the mosaic tiles with grout, spreading it with a grout float. Move the float from different directions to fill the tiles completely. Wait 10 minutes for the grout to begin to dry, then clean the tiles with a damp sponge. The holes will be left filled with grout.
Grouting and Leaving Holes Bare
If your tiles have visible holes and you want to make them nonporous but still visible, fill them with sealer prior to grouting them. Paint the sealer onto the mosaics, covering not only their surfaces, but also the holes. The idea is to get the sealer into the holes so the grout releases from them. Grouting the mosaics takes longer. Instead of a grout float, use a grout bag to pipe the grout between the mosaics, then lightly press it in with a float. Have a sponge ready to wipe out any excess grout if it enters a hole.
Rinse with WHITE VINEGAR, Works best
use a cake decorating bag and tip! Then your finger to wipe the lines down!! And always use unsanded grout!
I wet down the tiles first, then the grout wipes off easier.