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Onyx countertops have pros and cons. If you seal it properly and take care not to damage it, it can make a good countertop surface. However, it's more often used in bathrooms, where it’s less likely to sustain damage. Having an onyx kitchen countertop is possible, but you’ll need to take extra care not to burn, stain, or otherwise damage the material.

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 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.

A minimum overhang of 10 to 12 inches is generally recommended for countertop or island seating to provide enough legroom. For increased comfort, an overhang of 15 to 18 inches is ideal, allowing for more space and a relaxed experience. However, a 10-inch overhang can be sufficient in certain situations, such as for bar-height countertops, when using small stools, or in smaller kitchens where space is limited. Taller countertops may also require less overhang than shorter ones. Ultimately, you should consider your specific needs for legroom and measure to ensure the overhang fits comfortably within your kitchen's layout.