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Yes, it is possible to cover old countertops with new ones. Using a countertop overlay to cover your existing countertop is a good way to get a totally new surface without removing your old countertops. This method can be more cost-effective and less time-consuming than a total replacement.

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.

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. 

While epoxy resin is generally durable, it is not scratch-proof. Some sources state it is highly resistant to scratches from minor sources, while others note it can scratch and chip easily from sharper or heavier items. To prevent damage, always use a cutting board and avoid sliding heavy or rough-bottomed objects across the surface. If a scratch does occur, be aware that epoxy can be difficult to repair by sanding, often requiring an orbital sander for effective results.