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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.

Marble is a porous natural stone that needs sealant to minimize staining. Leaving this type of countertop material sealant-free means any liquids left on the surface will quickly absorb into the stone, discoloring it and dulling the sheen. Dark or acidic liquids, like red wine, coffee, and lemon, are the worst culprits. 

Rubbing alcohol won’t damage most countertops, and you can mix it with water to create a disinfecting spray to keep your kitchen clean. It’s safer than using bleach on countertops, which can stain and cause discoloration. Be careful with rubbing alcohol when it comes to lacquered or varnished surfaces, though.

You should always seal cut countertops to prevent damage and to keep them looking their best. The right way to seal countertops depends on the type of material. For laminate and wood, apply epoxy or other specialty sealers by pouring it onto the countertop and letting it flow across the whole surface to the edges, guiding it with a paint stick or putty knife. You will need to move quickly so that it does not dry or harden before you are done. For stone countertops, use a sealant specially manufactured for your type of stone and apply it according to manufacturer directions.