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The best tool for cutting countertops depends on the type of countertop material. For some softer materials, like laminate (Formica) and butcher block, you can use a hand saw, but most experts recommend power saws like circular saws, since these make the job go faster and easier and give more even results. However, power saws and circular saws are dangerous if used incorrectly, and they can be so powerful that they damage or chip laminate, stone, and other types of countertops. For this reason, you should take safety precautions and use best practices to prevent damage.

Yes, onyx is more expensive than granite. Its higher cost is due to its rarity, delicate nature, and the specialized care it requires. While granite countertops typically cost between $2,000 and $4,000, onyx is considered a premium material. Its luxurious, translucent appearance and unique ability to be backlit also contribute to the higher price. In terms of durability, granite is a hard, durable surface, whereas onyx is more delicate and can be damaged if not handled carefully.

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. 

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.