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Quartz countertops are not recommended for outdoor use. While durable indoors, they are not designed to withstand outdoor conditions like sunlight, weather, and high heat from barbeque grills. Exposure to these elements, particularly UV rays, can cause the resins in the quartz to break down, leading to discoloration and damage to the surface. For a longer-lasting outdoor countertop, it is better to choose a natural stone like granite, which has greater resistance to these elements.

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.

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 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.