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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.

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

Porcelain is a relatively affordable, mid-range countertop material. It typically costs between $50 to $70 per square foot.

Compared to quartz, porcelain is slightly more affordable, as quartz generally ranges from $50 to $200 per square foot. However, lower-quality, builder's grade quartz can be similar in price to porcelain.

Compared to granite, the price can be similar, depending on the quality of the stone. While granite slabs can range from $50 to $200 per square foot, you can find lower-end granite in the same price range as porcelain. High-end granites will cost significantly more.

Porcelain is generally more expensive than laminate, acrylic, and ceramic, but less expensive than high-end slate, concrete, and marble. A key benefit is that porcelain does not require sealing, which reduces long-term maintenance costs.

Formica® countertops last an average of 10 to 15 years. Top-quality materials that are well looked after and in a low-traffic kitchen could look good for 20 to 30 years or more—but you may want to replace them to modernize your space before they start to look shabby. Avoiding harsh cleaners and using chopping boards can help keep your Formica® countertops looking good for longer.