Asphalt Sealcoating
The single most cost-effective way to extend the life of your asphalt driveway or parking lot. Castle Driveway Corp. has been protecting pavement in Westchester and Fairfield counties since 1979.
What Is Asphalt Sealcoating?
Sealcoating is the application of a protective liquid coating — typically coal-tar emulsion or asphalt-based emulsion — over the surface of an existing asphalt driveway or parking lot. The coating penetrates the surface pores and forms a barrier against the four primary causes of asphalt deterioration: ultraviolet radiation, water infiltration, petroleum spills, and freeze-thaw cycling.
A properly applied sealcoat does not fill cracks — that is a separate process (see our Crack Filling service). Sealcoating is a surface treatment that slows oxidation, restores the dark appearance of fresh asphalt, and buys years of additional service life at a fraction of the cost of resurfacing or replacement.
In Westchester County's climate — with an average of 30+ freeze-thaw cycles per winter — sealcoating every 2–4 years is the standard maintenance interval for residential driveways. Commercial lots with heavier traffic may require annual treatment.
Benefits of Professional Sealcoating
UV Protection
Asphalt binder oxidizes and becomes brittle when exposed to sunlight. Sealcoating blocks UV rays and slows the oxidation process, keeping the surface flexible.
Water Resistance
Water is asphalt's primary enemy. Sealcoating seals surface pores and prevents water from reaching the sub-base, where it causes heaving and cracking.
Freeze-Thaw Defense
In NY winters, water that penetrates unsealed asphalt expands when it freezes, widening existing micro-cracks. Sealcoating eliminates the entry point.
Oil & Chemical Resistance
Petroleum spills from vehicles soften and dissolve asphalt binder. A sealed surface resists penetration and is far easier to clean.
Extended Pavement Life
Studies show that a consistent sealcoating program can double the service life of an asphalt driveway, from 15 years to 30+ years.
Curb Appeal
A freshly sealed driveway has a uniform, deep-black appearance that significantly improves the look of any residential or commercial property.
Our Sealcoating Process
Surface Inspection
We walk the entire driveway and identify cracks, potholes, oil stains, and drainage issues before any work begins. Cracks wider than ¼ inch are flagged for hot crack filling prior to sealing.
Power Washing & Cleaning
The surface is thoroughly power washed to remove dirt, debris, and loose material. Oil spots are treated with a commercial degreaser and primed with a bonding agent to ensure proper adhesion.
Edge Masking
We mask all edges — garage doors, curbs, walkways, and landscaping borders — to ensure clean, straight lines and protect adjacent surfaces.
Sealcoat Application
We apply two coats of our commercial-grade sealcoat using squeegees and spray equipment, depending on surface texture. The first coat is allowed to cure before the second is applied.
Drying & Cure Time
The sealed surface requires 24–48 hours of drying time before foot traffic and 48–72 hours before vehicle traffic, depending on temperature and humidity.
Final Inspection
We walk the completed job with you, confirm uniform coverage, and provide care instructions for the first 30 days.
Frequently Asked Questions
How often should I sealcoat my driveway?
For residential driveways in Westchester County, every 2–4 years is the standard recommendation. New asphalt should not be sealed for the first 6–12 months to allow the binder to fully cure.
What is the best time of year to sealcoat?
Late spring through early fall — when temperatures are consistently above 50°F and no rain is forecast for 24 hours. We do not apply sealcoat in temperatures below 50°F or when rain is expected.
How long does sealcoating last?
A professionally applied sealcoat typically lasts 3–5 years on a residential driveway with normal use. Heavy vehicle traffic, chemical exposure, and extreme weather can shorten that interval.
Can I sealcoat over cracks?
No. Cracks must be filled before sealcoating. Applying sealcoat over open cracks traps moisture and accelerates deterioration. We always address cracks as a separate step before sealing.
How much does sealcoating cost?
Residential driveway sealcoating in Westchester typically ranges from $0.15–$0.30 per square foot depending on driveway size, condition, and number of coats. We provide free, no-obligation estimates.
Ready to Protect Your Driveway?
Get a free, no-obligation estimate. We serve residential and commercial properties throughout Westchester and Fairfield counties.