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You can’t change the color of the stone, but you can update granite countertops without replacing them by painting them. Because granite is a porous material, you’ll want to seal them first before painting them so that the paint doesn’t hurt the surface. This is important because you don’t want to devalue your counters by damaging the original surface; even if you don’t like the color now, you or a new homeowner may want to remove the paint someday and return them to their original color. You can also cover them with 

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.

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.

The best cleaning method to use for your project will depend on the specifics of that project. However, sandblasting does come with the risk of damaging the surface you’re trying to clean. One safer alternative to sandblasting is laser cleaning, which can remove many of the same contaminants with a lower risk of damage and a lower overall cost.