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Marble countertops are often considered better than limestone because of their superior durability and luxurious appearance. Marble is harder and less prone to scratching and denting, though it still requires maintenance and sealing to prevent stains and etching. Marble is typically more expensive, but its beautiful veining and range of colors offer a high-end look. 

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.

Extensive chips and cracks may require a full replacement of the countertop. The cost to install a new countertop is around $3,100 on average. But, if the damaged area is relatively small, you may want to consider repairing it yourself or calling in a qualified professional. Depending on the material, some epoxy and sandpaper may do the trick. Or you can consider painting laminate countertops or refinishing butcher block countertops.

Yes, you can remove an undermount sink from granite countertops. However, it’s safest to hire a granite pro to take on this job. Your pro might have to make cuts and grind the granite to remove the sink. Plus, if you’re replacing your sink with a larger one, you’ll need your pro to enlarge the existing sink cutout in your granite.