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The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.

Granite countertops can last for 100 years or more with proper maintenance, even in high-traffic areas like kitchens and bathrooms. Granite can crack, stain, or fade over time, like any countertop material, but it’s a highly durable option that should offer a lifetime of use. Some ways to increase the longevity of granite countertops include regularly cleaning the surface, especially after spills, avoiding sharp objects directly on the countertop, and resealing the material every few years.

The most expensive countertop materials are marble and granite. These natural materials are very heavy and require specialized tools and knowledge to install. Their natural veins and flecks elevate the design and make a beautiful statement in the kitchen or bathroom. Because they’re natural, no two countertops will be the same. 

Concrete countertops require regular upkeep and can be harder to maintain than other materials. For daily cleaning, use a mild, pH-neutral cleaner and avoid harsh, acidic products that can damage the sealant. It's important to wipe up spills immediately, especially from acidic substances, as concrete stains easily. To prevent scratches, always use a cutting board. The countertops must be resealed periodically—at least once a year—to protect them from stains and moisture. Be aware that concrete is also prone to cracking over time and may require repairs.