All natural stone is porous due to the sheer number of capillary pores that can pass around the liquids and gases. There are many types of natural stone, such as; sandstone, calcareous, marble, travertine, slate, granite, and basalt; all are porous materials that serve like strong sponges, which soak up liquids, dissolved salts, which minerals over a long time span. MORE Surface Care-Best Marble Sealer is an excellent resource for this.
Sandstone is considered a very porous stone as it absorbs liquids fairly quickly, whereas the denser igneous stones such as granite are much less porous and can take an hour or more to absorb water-based liquids and oils.
Natural stones such as Sandstone , Limestone, and Marble are used in a number of places around the home and in public areas. It has been a common material for building and decorating since ancient times since stone has excellent durability , strength, and insulation properties.
While the variety of colors and stone styles make it a genuinely versatile material for landscaping and building, this type of stone must be sealed to avoid damage from staining.
Back in ancient Roman times, Sandstone and natural stone were sealed with Olive Oil that offered some protection from the elements against general weathering. Europeans later chose to use topical sealers and varnishes made from egg whites and natural resins during the Renaissance era. They were transparent in color and formed a protective layer when applied wet, and hardened the stone.
Traditional stone sealers are now classified into three types: topical sealers, Impregnating sealers and Penetrating sealers.
A topical sealer is effective in avoiding stains but, when it is visible on the material surface, it may begin to wear out fairly quickly, more so if the flooring is regularly used. The stone’s slip resistance and look will greatly change, particularly when it’s wet.
Topical sealers do not allow gasesor water vapor to escape, so they are not going to be successful against surface salt crystallization.
Topical sealers typically are made of polyurethane or acrylic.
Penetrating sealants are breathable to some degree but can only penetrate to less than 1 mm
Within the stone surface-just enough to hold the material to the rock. This form of sealer usually lasts longer than the topical sealer, but they do not affect the stone ‘s appearance, so the slip resistance on the stone ‘s surface will wear relatively easily. A form of sealer is not designed to avoid surface salt crystallization.