A stone sealer is a protective coating applied to natural stone surfaces, such as granite, marble, and limestone. Its primary purpose is to prevent stains, moisture, and dirt from penetrating the stone, which can lead to damage over time. Sealers can be either penetrating or topical, with penetrating sealers soaking into the stone and topical sealers forming a protective layer on the surface. Applying a stone sealer is essential for maintaining the beauty and longevity of stone surfaces, especially in high-traffic areas or places exposed to spills, like kitchens and bathrooms. Regular reapplication is often necessary, depending on the type of sealer used and the stone's porosity.