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Concrete countertops require regular upkeep to maintain their appearance and durability, and are generally considered 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 is crucial to wipe up spills immediately, especially from acidic substances, as concrete stains easily. To protect against stains and moisture, the countertops must be resealed periodically—at least once a year, if not more frequently. Additionally, use a cutting board to avoid scratching the surface. Be aware that concrete is also prone to cracking over time, which may require repairs.

Countertops typically hang over base cabinets by 1.5 inches. This slight overhang protects cabinet faces from spills and provides a finished look. The overhang may extend 12 inches or more for kitchen islands or breakfast bars to allow for seating and comfortable eating.

Yes, onyx countertops can scratch easily—especially if they’re not adequately sealed. But with the proper maintenance (which includes re-sealing the countertops to protect them from damage), you can prevent your onyx countertops from scratching and repair any damage quickly to prevent it from worsening.

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.