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There are many benefits of granite countertops, but it’s not unusual for them to have seams—especially if you’re working with small slabs joined together. Seams are common on larger islands where the installer needs to use more than one granite slab to cover the surface. Luckily, because seams are normal in granite countertops, pros know how to hide them properly, so you’d never know they were there.

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.

While onyx is among the most expensive countertop stones, it’s not always the priciest. It is generally cheaper than Calacatta marble, which is highly sought-after for its rarity and bold veining. However, onyx still commands a premium price due to its unique translucency and delicate nature.

Most recycled glass countertops are nonporous, so they don’t require sealant. There is, however, one major exception. If your recycled glass countertop contains a cement binder, it’ll require an additional layer of protection. Seal these countertops once or twice a year. Use a concrete sealant and finish it with a food-safe wax for a gorgeous and shiny finish. Otherwise, just clean the countertop regularly and always use a cutting board.