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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.

If you have light renovation experience, you should be able to build your own countertop made from wood or laminate. These tend to be the most DIY-friendly materials, but you’ll need to be comfortable using a circular saw and taking precise measurements. When it comes to installation, leave anything that involves plumbing, electricity, or gas lines to the pros.

Avoid using harsh, gritty, or abrasive cleaners and sponges on Formica countertops. This includes steel wool, scouring pads, and strongly alkaline or acidic cleaning products like chlorine bleach, oven cleaner, drain cleaner, furniture polish, or vinegar. These can compromise the surface, leading to scuffs, discoloration, and other damage that will reduce the countertop's longevity. Additionally, never place hot items, such as pots and pans directly from the oven or stovetop, onto the laminate surface, as the high heat can cause it to scorch.

No, you don't have to apply polyurethane to butcher block countertops. Polyurethane sealant is a long-lasting finish for a butcher block counter, but its application also requires thoroughly sanding the surface multiple times. Other materials, such as mineral oil, require less work but must be applied more frequently.