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How often you need to reseal marble countertops depends on the quality and color of the stone, the traffic on the surface, and the type of sealant. Sealing at least once a year is the general rule of thumb. However, if your large family loves to cook or the countertops are in a busy family bathroom, you might have to reseal them every six months (or more). The surfaces of your rarely used guest bathroom might not need resealing for a few years.

Granite should be resealed every 12 to 18 months, depending on the color and usage. Lighter granite needs to be resealed more frequently than darker colors. If you use acidic cleaners or prepare food on the surface regularly, you must reseal the surface more frequently. Without proper sealing, granite is vulnerable to staining. You can tell if your countertop needs to be resealed by placing a wet paper towel on the counter for 10 minutes. If the water beads up, it is still sufficiently sealed; if it sinks in, it’s time to apply sealant.

Quartzite countertops are porous, meaning that liquids can seep into the stone and stain them. You’ll need to seal them before installing and resealing annually, depending on use and stone material. Sealing will help prevent stains and etching. On the other hand, you don’t need to seal quartz and other engineered stone countertops since they aren’t porous.

It depends on the material. Sandstone, slate, and granite can be slippery in wet weather. Applying a sealant to the stone can often stop it from absorbing moisture and may reduce the likelihood of slipping. If you're concerned about losing footing, a safer option might be bluestone or concrete.