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Concrete and granite are both extremely durable materials. One isn’t necessarily better than the other. It depends on what you’re looking for. That said, granite is less costly and requires less maintenance. Furthermore, concrete is more prone to staining and cracking, though you can patch the cracks using a concrete patching compound.

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, a 12-inch countertop overhang will need support to keep it stable. The exact type of support depends on your countertop thickness and material. Thicker, heavier countertops need extra support, like a corbel or a post, to keep them from sagging or toppling over.

Yes, Corian® and other solid surface countertops can be cut with standard woodworking tools like a circular saw or a jigsaw, but using the correct blade is crucial for the best results.

The recommended blade is a tungsten carbide-tipped blade, often called a solid-surface planer or triple chip grind blade. This type of blade is hard enough to cut through the material effectively. For a jigsaw, a fine-tooth down-cutting blade should be used.

It is important to note that a diamond blade is not necessary. Diamond blades are designed for harder materials like natural stone, concrete, or brick, and Corian is not a natural stone.

Using blades designed for wood is not recommended as they can cause microfractures that weaken the countertop's edges. While a tungsten carbide blade provides a much cleaner cut, the resulting edge will still be rough and must be sanded and smoothed to prevent microfractures from developing over time.