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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.

While quartz holds up well against stains of all kinds, it isn’t completely resistant. Make sure to wipe up water and other liquids as soon as possible to prevent stains. If you spot water stains on your quartz countertops, you can clean quartz counters in just a few steps using simple household cleaners, like dish soap or baking soda paste.

Use a pH-balanced cleaner, avoid abrasive materials, and reseal porous stones like granite annually to maintain durability.