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A water-based, low- or no-VOC sealer is typically a good choice for marble countertops. Choose a sealant that is certified safe for contact with food when applying to kitchen countertops. For high-traffic areas, look for formulas that have heat-resistant and acid-resistant features. While there are economical and convenient spray-on sealers, they don’t coat the surface as effectively as the ones you apply with a pad or brush. 

Granite and marble compare well against each other in terms of price, durability, and aesthetic appeal. Deciding which one is better depends on your personal style and preference. Both materials resist damage like chips and cracks well. You should seal both material types against staining and etching, but they’re still susceptible if oil, wine, coffee, tomato sauce, or juice are left on the countertop long enough. As material and installation costs range similarly, the deciding factor is your budget, design, and preferences.

No, using a power sander on brick is not recommended because the force of the sander can destroy brick's fragile outer layer. Even using sandpaper on brick is discouraged because of the damage its abrasiveness can cause.

To clean stone tiles, first sweep or vacuum to remove dirt particles. Use a mild, pH-neutral detergent and warm water to mop. Be careful not to use acidic cleaning solutions, such as vinegar and lemon juice, which can damage the surface.