What Is Sealcoating?
Sealcoating is the application of a liquid protective coating — made from coal tar, asphalt emulsion, or acrylics — to the surface of an existing asphalt pavement. It is brushed or spray-applied in thin, even coats and, once cured, forms a hard, protective shell over the asphalt surface.
Think of it the same way you think about painting a house: the paint does not structurally reinforce the wood, but it keeps moisture out and dramatically extends the life of the structure underneath. Sealcoating does the same for your asphalt.
The 6 Key Benefits of Sealcoating
1. UV Ray Protection
Asphalt is particularly vulnerable to oxidation from the sun's UV rays. Over time, UV exposure causes the asphalt binder — the "glue" that holds the aggregate together — to dry out and become brittle. You can see this process happening when asphalt turns from a rich black to a faded grey color. Sealcoating blocks UV rays and slows this oxidation dramatically.
2. Water and Freeze-Thaw Protection
Water is asphalt's biggest enemy in the Northeast. When water infiltrates unsecured asphalt cracks and then freezes in winter, it expands, widening the cracks and destabilizing the sub-base below. A proper sealcoat fills micro-cracks and creates a waterproof membrane that prevents infiltration.
Commercial-grade sealcoating equipment ensures even application and long-lasting results.
3. Oil and Chemical Resistance
Petroleum products — gasoline, motor oil, and power steering fluid — dissolve the binder in asphalt. Driveways and parking lots frequently receive these spills from everyday vehicle use. Sealcoating creates a resistant barrier that prevents these chemicals from penetrating and softening the surface.
4. Restored Aesthetics
A freshly sealcoated surface looks as close to brand-new asphalt as possible. The deep, rich black color restores curb appeal instantly and makes painted line striping pop with much greater visibility. This is especially important for commercial properties wanting to project a clean, professional image.
5. Extends Pavement Life by Years
Research consistently shows that asphalt that is regularly sealcoated lasts significantly longer than unprotected asphalt — in many cases, a properly maintained and sealed pavement can last twice as long. Considering that a full repaving costs 5-10x more than a sealcoating job, the ROI is exceptional.
When Should You Sealcoat?
New asphalt should cure for at least 6 to 12 months before the first sealcoat — the oils need time to off-gas and stabilize. After that, plan to sealcoat every 2 to 3 years for residential driveways, and every 1 to 2 years for high-traffic commercial lots. Temperature at application must be above 50°F for the sealer to cure properly.
6. Easier Cleaning and Maintenance
A smooth, sealed asphalt surface is dramatically easier to sweep and clean than porous, oxidized asphalt. Snow and ice removal is also easier since the sealed surface provides less grip for compacted snow and ice to adhere to.
What to Expect From a Professional Sealcoating Job
- Surface Preparation: All cracks are filled and all edges are cleaned of weeds and loose material before sealer is applied.
- Oil Spot Primer: Petroleum stains are treated with a special primer to prevent them from bleeding through the sealcoat.
- Application: Two coats of commercial-grade sealer are applied by brush, squeegee, or spray for a uniform, professional finish.
- Cure Time: The surface needs 24-48 hours to fully cure before vehicle traffic is allowed back on it.
Ready to protect your asphalt investment? Get your free sealcoating estimate from JL Construction today!