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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.

Installing new kitchen countertops costs $1,850 to $4,450, with an average price of $3,140. Some materials, like marble and granite, are more expensive than others. Additionally, the size of the countertop impacts the overall price. Labor accounts for 10% to 20% of the overall project cost. Add-ons, like edging and corner treatments, also increase the cost.

Most recycled glass countertops are nonporous, so they don’t require sealant. There is, however, one major exception. If your recycled glass countertop contains a cement binder, it’ll require an additional layer of protection. Seal these countertops once or twice a year. Use a concrete sealant and finish it with a food-safe wax for a gorgeous and shiny finish. Otherwise, just clean the countertop regularly and always use a cutting board.