Staff Answer
Sep 28, 2026 - 01:42 PM
Yes, this product could be used indoors. For a backsplash, let's start here...
Always test GBS Penetrating Sealer in an inconspicuous location first. FOUR Surface Minimum Requirements BEFORE Applying:
Is your surface...
1) Porous
2) Clean
3) Dry
4) Neutral pH
Porous means it should be able to soak in. If sealers or adhesives are on the surface, they will prevent absorption.
How to Test? Place a few drops of water onto the surface and see if it beads up or soaks in. If it soaks in, then the surface is porous, and GBS Penetrating Sealer will also soak in. Nothing else is needed except to make sure your backsplash surface is clean, dry, and has a neutral pH.
If, however, water beads up and does not soak in for about an hour, it's very probable that there is something already on the surface (or the stones have been polished and made non-porous).
Have more questions, give us a call and we can discuss your project and find the best product for you. 1-800-405-0222
