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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. 

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.

Silestone® is a low-maintenance countertop material, but certain things, like strong chemicals and solvents, can cause damage. Abrasive scrubs can cause scratches, and products that contain oil or powder can leave a residue. Finally, avoid letting oven cleaner come into contact with Silestone® because it can cause discoloration.

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.