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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 

Silestone® isn’t recommended for outdoor use because UV rays can damage the surface. Long-term exposure to direct sunlight can cause discoloration. Instead, choose an outdoor-friendly countertop material like tile, concrete, stainless steel, or natural stone. If you do choose a natural stone, make sure you either seal it or avoid highly porous stones. For example, choose soapstone over marble.

Use pH-neutral cleaners, avoid acidic substances, and reseal porous stones periodically to maintain their finish.

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.