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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. 

Costs depend on stone type, surface condition, labor, and whether sealing or deep cleaning is required.

White quartz is a very low-maintenance countertop material. It’s nonporous, so it won’t stain, even if you spill dark liquids on it. The light color will make dirt show up much easier, but a simple wipe-down will keep the countertops looking fresh and bright for years to come. However, it might not be the best kitchen countertop idea on a budget because it's expensive.

Like most stones, limestone should be sealed. Its porous nature makes it prone to staining from spills, and the iron in the stone can cause it to turn yellow when exposed to moisture or harsh chemicals. Proper sealing can help prevent these problems and protect the stone's appearance.