Does an impregnator sealer provide stain proof to the stone?
No. Most penetrating sealers are designed to be either water or oil resistant, not water or oil proof If a liquid is left on the stone long enough, it will eventually penetrate and stain. Penetrating sealers are designed to give you time to clean up the spill before staining occurs. Nor are they designed to prevent acid etching that happens from lemon, vinegar, tomato and other acidic foods and drinks. Any acid will etch the surface of most marble and limestone, whether scaled or unsealed.
