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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.

Quartz countertops are known for their durability, but they aren’t indestructible. Quartz countertops can crack under extreme pressure, like when experiencing a heavy impact. The same can happen with regular exposure to high temperatures. Finally, improper installation makes the quartz more vulnerable. 

If you have light renovation experience, you should be able to build your own countertop made from wood or laminate. These tend to be the most DIY-friendly materials, but you’ll need to be comfortable using a circular saw and taking precise measurements. When it comes to installation, leave anything that involves plumbing, electricity, or gas lines to the pros.

Concrete countertops are made food-grade through their sealant and the continued use of a food-grade cleaner. For that reason, it is important not to use acidic cleaners or bleach. Read the ingredients on any cleaner and avoid products with vinegar, acid, or anything else that could eat away at the concrete's sealant.