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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. 

To remove cloudiness from marble, use equal parts baking soda and water to form a paste. Apply it to the surface, allow it to sit for at least two hours, then wipe with a microfiber cloth. Another option is adding a couple of dish soap drops to warm water and wiping the surface after you’ve applied it to the surface. You may also consider using a liquid stone cleaner.

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.

In most cases, chipped or cracked granite can be salvaged, but it depends on the size and scope of the damage. For example, a pro can smooth out small chips on the edge with polish pads or an angle grinder, but a crack that runs through the stone's surface has little-to-no chance of being fixed easily.