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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.

With the cost of kitchen countertops ranging from $1,900 to $4,300, you’ll want to choose a countertop material that’s durable and cost-effective. Marble countertops will come in on the high-end, whereas corian, quartz, stainless steel, and granite will run in the middle range. Butcher block and laminate are the most budget-friendly—and many DIYers choose to install butcher block on their own because it’s one of the more accessible countertops.

The cost of granite countertops is around $3,250 for most homeowners, but you could pay as low as $500 or over $4,000, depending on the size of your project and some other factors. In addition to the square feet of granite you need, your pricing will also depend on the following:

• Granite thickness 

• Quality and rarity of the granite, labeled in levels from one to five

• Granite color and texture 

• Countertop design

Quartz countertops are relatively expensive, but they’re a very popular option because of their durability and attractive design. Some manufacturers also offer lifetime guarantees for their products. Even though they’re expensive, they could wind up being a one-time purchase.