MB-4 Impregnator for Stone & More is a proprietary water-based penetrating (below-surface) sealer for all natural stone, grout, “terracotta,” concrete and any other kind of porous mineral and man-made material.
MB-4 seals (below-surface) almost anything it is applied on, from any kind of water borne discoloring agents and oil. MB-4 is warranted to be effective for at least 10 years for indoor applications – with the exception of polished stone floors when they are restored (refinished) – providing that the surface of the treated stone is maintained with compatible cleaning chemicals, such as our MB-1, MB-3, MB-5, MB-9. Like any other impregnator MB-4 is not effective against scratches and other surface damage such as chemical etches (wrongly referred to as “water stains” or “rings”) produced by accidental spills of pH active substances such as vinegar, orange or lemon juice, wine, perfume, etc. or the use of non-specialty cleaning products.
MB-4 will not alter the original color of most stones. To make sure, test on a spare tile or scrap of slab (following directions) and let cure for at least 48 hours to see final appearance. Do not seal stones that don’t need to be sealed.