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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.

You attach solid surface counters with construction adhesive. Once your slab is ready, you fit it to the wall, apply the adhesive, and secure it in place with clamps until the glue dries. This usually takes several days. 

Afterward, you install the backsplash, faucets, and more. At this point, you can caulk the counter, allow it to dry for 24 hours, and then you're done with the installation.

Concrete countertops usually cost more than granite. The average overall cost to install concrete countertops is $50 to $150 per square foot. Granite countertop costs average between $40 and $50 per square foot. While concrete materials might be cheaper than slabs of granite, the labor costs are considerably higher as it takes more time, specialized equipment and skill to form customized concrete countertops.

Quartzite is more expensive than granite, largely because of its rarity. Granite is naturally more common. A granite slab generally costs $40 to $60 per square foot (excluding super-rare types), while quartzite slabs cost anywhere from $50 to $150 per square foot. 

With both materials, it’s usually more affordable to purchase stones that are readily available in your location. You may need to import other stones, which come at a higher cost.