Has anyone tried to densify sandstone?

I assume it would not work on a quartzic sandstone, but may be possible on a calcerous sandstone, (ASTM type 4.1.1)  Any thoughts regarding sodium/potassium/lithium silicates. The floor has been sealed with 3 coats of “Dry Treat” so it may not get a reaction…if it is a reactive type of densifier to be used.

Just looking for a way to fill the pores for a biege sandstone (very similar to Himalyan) which is in a high traffic commercial area, and very difficult to keep clean.