Sealer to protect your grout should be done every 2 years.
The dirt would avoid tiled countertops due to keep them looking clean in addition to the grout even after they are sealed it is very difficult to keep them looking clean in addition to keep them looking clean in addition to the grout even after.
The customer is always right even when they arent no surface finish please rev steven.
The customer is always right even when they arent no surface finish please do not add finishes especially on surfaces that contact with food gads.
I put tiles on a counter top in one house I lived in…15 or so years ago. I would not recommend it…high maintenance and even with sealer, hard to keep looking clean…I would suggest some artificial slate in lieu of tile. Anything with a smooth, flat surface.