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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. 

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.

The standard kitchen counter size is typically between 24 to 25 inches wide and 25 to 26 inches deep. Wider countertops are also common, with widths of 30 to 36 inches among the most popular choices. Note that these are just general guidelines, and there is flexibility to custom the size of countertops to suit individual needs and the space.

The lifespan of painted countertops depends on the products used and how well they are maintained. Generally, they can last for a couple of years before needing a fresh coat. To maximize their longevity, it is vital to apply a durable sealer, such as a resin or water-based acrylic topcoat, over the paint. After applying the sealer, allow it to cure for the full recommended time, which can range from seven to ten days, to ensure a fully protected surface.