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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.

With proper maintenance, concrete countertops can last for decades, with a life expectancy of 50 years or more. At a minimum, they should last 20 years before major issues arise. Their longevity depends on the quality of materials, proper installation, and consistent care. Because concrete is porous, it is prone to cracking and staining. Regular maintenance, including resealing, waxing, and repairing any chips or cracks, is essential to preserve its lifespan.

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.

Both quartz and granite are durable, long-lasting countertop materials that can last for decades, potentially the lifetime of your kitchen, with proper maintenance. Quartz is generally considered more durable than granite due to its nonporous nature. However, it can be damaged by extreme heat. Granite is also very durable but is a porous material that requires regular resealing to extend its lifespan and prevent stains. On the other hand, granite is more resistant to heat than quartz.