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You can resurface existing countertops as long as they’re not significantly damaged. Of course, it does depend on the material. Wood, natural stone, quartz, and even laminate are all good candidates for resurfacing. If you have tile, you may want to just replace the damaged tiles rather than resurface the entire countertop.

Engineered stone is nonporous, unlike natural stone, and does not need to be sealed. You do not have to worry about etching or bacterial growth. It is more durable than natural stone and concrete, as well as highly heat resistant. Engineered stone is easy to clean and maintain. You can wipe it down with warm water and soap. Use a non-scratch scrub pad for stains and avoid any harsh cleaners. Engineered stone can even be eco-friendly, with some manufacturers using waste byproducts or organic resins.

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.

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.