Terradur Densifier Impregnator is a unique stone densifier and hardener.  Typically used in between grits of Diamond Polishing Pads

For use
on soft and porous stones such as limestone, travertine and terrazzo. 

Terradur penetrates the stone reacting with the calcium forming crystals that expand filling the pores and reducing the porosity to allow a significantly higher shine or clarity when polishing. Wear resistance is also increased.