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Yes, it is possible to cover old countertops with new ones. Using a countertop overlay to cover your existing countertop is a good way to get a totally new surface without removing your old countertops. This method can be more cost-effective and less time-consuming than a total replacement.

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.

You most likely purchased a quartz countertop because it won't stain or etch like marble. However, etching can still happen depending on the quality of the quartz and whether it is repeatedly cleaned with harsh chemicals or exposed to acidic spills. Remember, while quartz is more resistant than natural stone, just like Superman when faced with Kryptonite, it is not indestructible.

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.