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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.

Some of the cheapest ways to change granite countertops without replacing them include painting, honing, or changing the finish, covering them with tile or laminate, and using countertop contact paper. Dollar for dollar, applying countertop film is the cheapest, easiest, and most reversible way to update the look of your countertops. No matter what you choose, remember that permanently marring the original countertops can cost you money when you’re trying to sell your home, so make smart choices and preserve the integrity of the granite.

Onyx countertops have pros and cons. If you seal it properly and take care not to damage it, it can make a good countertop surface. However, it's more often used in bathrooms, where it’s less likely to sustain damage. Having an onyx kitchen countertop is possible, but you’ll need to take extra care not to burn, stain, or otherwise damage the material.

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.