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A water-based, low- or no-VOC sealer is typically a good choice for marble countertops. Choose a sealant that is certified safe for contact with food when applying to kitchen countertops. For high-traffic areas, look for formulas that have heat-resistant and acid-resistant features. While there are economical and convenient spray-on sealers, they don’t coat the surface as effectively as the ones you apply with a pad or brush. 

You can cut granite countertops after installing them, but you need to consider the mess it will make. Dust will be everywhere, and lots of protective gear will be required. On top of that, you will need to measure meticulously to make sure the cuts you make are perfect; otherwise, you’ll be stuck having to replace the entire slab of granite, which is a much bigger job. 

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.

White quartz is a very low-maintenance countertop material. It’s nonporous, so it won’t stain, even if you spill dark liquids on it. The light color will make dirt show up much easier, but a simple wipe-down will keep the countertops looking fresh and bright for years to come. However, it might not be the best kitchen countertop idea on a budget because it's expensive.