With some grouts that can be even worse with it needing sealer.
Sealer for natural stone backsplash tiles and grout.
Using solvent based sealer will prevent you from have to re seal as often.
If over time your stone tile stops deflecting water you will need to apply sealer again.
Even tiles that have a pre existing sealer can eventually have that layer wear down over time.
Failure to do this can lead to the grout chipping and coming off over a short amount of time.
Seal the tile not the grout many tiles especially natural stone such as slate marble and limestone are porous and need to be sealed.
Dip a foam paintbrush into the sealer and paint the sealer onto the backsplash.
Use broad overlapping strokes working from top to bottom to prevent drips.
Let the sealer penetrate the stone for.
Any tile that is ceramic porcelain or natural stone needs to be periodically sealed.
It is wise to apply the sealer to your natural stone tile before grouting and once again the day after grouting.