Natural stone varies widely in porosity, mineral composition, finish and outdoor exposure. Acids, salts, moisture and staining affect each type differently.

A compatible impregnator may reduce liquid absorption without forming a visible film. Other coatings can darken the stone, trap moisture or alter slip resistance.

Scratch prevention and complete resistance to drinks or mud cannot be assumed. A test area, moisture assessment and the stone supplier's guidance are essential.

This article documents a former AVP niche service. Stone treatment should be specified by a qualified stone-care specialist for the actual material and use.