When should I reseal my natural stone kitchen countertops?

Most granite and natural stone kitchen countertops should be resealed once per year, though NB's humid maritime summers and dry heated winters can accelerate wear on sealant, making twice-yearly sealing a smart practice for high-use kitchens. The simple water test tells you exactly when resealing is due: pour a small amount of water on the surface and wait 10 to 15 minutes. If the water beads up, the seal is intact. If it soaks in and darkens the stone, it is time to reseal.

Different natural stones have different sealing needs. Granite is the most common natural stone countertop in New Brunswick kitchens and typically needs sealing every 12 months. Darker granites like Absolute Black are denser and may only need sealing every 18 to 24 months, while lighter, more porous granites like Kashmir White may need it every 6 months. Marble is far more porous than granite and should be sealed every 6 months — though marble is rarely recommended for kitchen countertops in NB due to its susceptibility to etching from acidic foods. Soapstone does not need sealing at all but benefits from periodic mineral oil applications for an even patina.

How to Reseal

Resealing is a straightforward DIY task that takes about an hour plus drying time. Clean the countertop thoroughly with a stone-safe cleaner — avoid vinegar, lemon, or bleach-based products that can damage natural stone. Let the surface dry completely. Apply a quality impregnating stone sealer (available at most Moncton, Fredericton, or Saint John home improvement stores for $15-$30 per bottle) using a clean cloth or foam applicator, working in small sections. Let the sealer absorb for 15 to 20 minutes, then wipe away any excess with a dry cloth. Allow 24 hours of curing time before using the countertop normally. Most sealers require two coats for optimal protection.

New Brunswick's climate creates specific challenges for natural stone. During humid summer months, moisture can work its way into unsealed stone, promoting bacteria growth and staining around the sink area. In winter, the extreme temperature difference between a cold exterior wall and warm kitchen air can cause condensation near window-adjacent countertops — another reason to keep that seal in good condition. If your granite was installed near an exterior wall in an older NB home with limited insulation, pay extra attention to sealing the edges and backsplash joint where moisture can wick in.

For granite countertops installed at $55-$110 per square foot, the $15-$30 annual cost of a bottle of sealer is minimal insurance to protect your investment. If you are unsure about your stone type or the right sealing schedule, ask the fabricator who installed your countertops — most countertop fabricators in the Moncton, Fredericton, and Saint John areas will provide guidance on care specific to your stone variety.

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Looking for experienced contractors? The New Brunswick Construction Network connects homeowners with qualified professionals:

• Thirty Four Renovations
• Gionetterenovations