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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.

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. 

Buffing is a less expensive and less time-consuming alternative to other floor repair techniques, but it’s only ideal for removing surface-level scratches and damages. Floor-buffing machines work to gently smooth out the floor’s top layer rather than removing it the way that sanding does. 

This process is ideal for gently worn floors, but it won’t have the desired impact on floors with severe damage. On the other hand, sanding fully strips the floor’s top layer so damages beneath the surface are accessible to remove or repair. Since the process is more involved, it requires more time, tools, and experience to achieve the best possible results.

In most cases, chipped or cracked granite can be salvaged, but it depends on the size and scope of the damage. For example, a pro can smooth out small chips on the edge with polish pads or an angle grinder, but a crack that runs through the stone's surface has little-to-no chance of being fixed easily.