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It is not recommended to put a hot pan directly on a marble countertop. While marble is heat-resistant, it is not completely heat-proof, and extreme or prolonged exposure to high heat can cause discoloration, cracking, or chipping. Pans may also scratch or nick the surface. To protect your countertop and maintain its integrity, always use trivets or hot pads. Note that faux marble finishes do not resist heat and require protection from hot items at all times.

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.

Marble countertops are often considered better than limestone because of their superior durability and luxurious appearance. Marble is harder and less prone to scratching and denting, though it still requires maintenance and sealing to prevent stains and etching. Marble is typically more expensive, but its beautiful veining and range of colors offer a high-end look. 

Unsealed granite is more susceptible to staining and other damage. Regularly sealing your granite countertops decreases the chances you’ll need to repair damaged countertops in the future. It also keeps it looking shiny rather than becoming dull over time. You can check whether your granite needs resealing by putting a few drops of water on the counter and waiting 15 minutes to see whether the water permeates the surface.