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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.

Yes, onyx is more expensive than granite. Its higher cost is due to its rarity, delicate nature, and the specialized care it requires. While granite countertops typically cost between $2,000 and $4,000, onyx is considered a premium material. Its luxurious, translucent appearance and unique ability to be backlit also contribute to the higher price. In terms of durability, granite is a hard, durable surface, whereas onyx is more delicate and can be damaged if not handled carefully.

You can cut food on tough, scratch-resistant granite countertops. However, these hard surfaces can quickly dull your knife blades, and continual cutting in the same spot can eventually lead to marks forming and compromising the protective sealant. As with any countertop material, it’s always best to use a chopping board.

Countertop overlays can be a worthwhile investment for homeowners looking for an affordable and fuss-free way to update their kitchens without a full replacement. The installation process is budget-friendly, saves time and labor, and can often be completed in a single day as it doesn't require demolition. Overlays are installed directly over the pre-existing countertop, with material options including quartz, granite, and recycled glass. However, for the overlay to be long-lasting, it is crucial that the underlying surface is properly prepped to ensure strong adhesion.