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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.

Onyx countertops are naturally porous, absorbing liquids and staining easily without proper care. Regular sealing every 6 to 12 months is essential to keep them looking their best. Daily maintenance includes wiping up spills immediately and avoiding harsh cleaners or acidic substances that can etch the surface. 

Yes, you can generally put hot pans directly on a granite countertop without worrying about cracking, as it is a durable, heat-resistant stone that can withstand high temperatures. However, it is still highly recommended to use a trivet or hot pad as a precaution. Prolonged or repeated exposure to high heat can potentially cause discoloration or damage the countertop's sealant, making it more susceptible to staining. Additionally, the heat from a pan can transfer to the granite, creating a burn hazard for anyone who touches the surface shortly after.

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.