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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.

You should always seal cut countertops to prevent damage and to keep them looking their best. The right way to seal countertops depends on the type of material. For laminate and wood, apply epoxy or other specialty sealers by pouring it onto the countertop and letting it flow across the whole surface to the edges, guiding it with a paint stick or putty knife. You will need to move quickly so that it does not dry or harden before you are done. For stone countertops, use a sealant specially manufactured for your type of stone and apply it according to manufacturer directions. 

Marble is a porous natural stone that needs sealant to minimize staining. Leaving this type of countertop material sealant-free means any liquids left on the surface will quickly absorb into the stone, discoloring it and dulling the sheen. Dark or acidic liquids, like red wine, coffee, and lemon, are the worst culprits. 

Yes, Corian® and other solid surface materials can be cut with standard woodworking tools, such as a circular saw or a jigsaw. However, it is crucial to use the correct type of blade to avoid damaging the material.

For a circular saw, a tungsten carbide-tipped blade is required; a triple chip grind blade is highly recommended. For a jigsaw, you should use a fine-tooth down-cutting blade. Do not use blades designed for cutting wood, as they can cause microfractures that weaken the edges of the countertop. A diamond blade is also unnecessary, as those are designed for harder materials like natural stone, which Corian is not.

After cutting, the edge will be rough. It is essential to sand and smooth the cut edge to prevent microfractures, which can eventually compromise the integrity of the countertop.