What Sealcoating Is
Sealcoating is a thin, protective coating applied to the surface of asphalt pavement. It’s not a structural treatment — it doesn’t fix cracks or repair damage — but it dramatically extends the life of healthy asphalt by protecting it from UV radiation, water, oil, gas, and freeze-thaw damage.
What Sealcoating Does
Asphalt is bound together by a petroleum binder. Sun, oxygen, water, and chemicals slowly break down that binder over time, leading to oxidation (gray, chalky surface), raveling (loose stones), cracking, and eventually pavement failure. Sealcoating creates a protective layer that blocks UV rays, repels water, resists oil and chemical attack, and slows the binder’s degradation. Result: 2x the pavement lifespan.
What Sealcoating Doesn’t Do
Sealcoating is preventive maintenance, not corrective repair. It does not fix cracks (that’s what crack sealing is for). It does not fix potholes. It does not fix sub-base failure. It does not change the underlying pavement condition. Properties that try to use sealcoating to ‘cover up’ failed pavement end up with sealer that fails along with the asphalt below.
How Sealcoating Is Applied
Step 1: Inspection and prep. Walk the lot, mark issues, set up barricades and signage. Step 2: Cleaning. Power blowers and mechanical sweepers remove debris, dust, and loose aggregate. Step 3: Crack fill. Hot-pour rubberized crack sealant fills cracks 1/4 inch wide or larger. Step 4: Oil-spot primer. Petroleum-stained areas get an oil-spot primer for adhesion. Step 5: First coat. Squeegee, brush, or spray application of commercial-grade sealer. Step 6: Second coat. After the first coat tacks (4 to 6 hours), the second coat goes on. Step 7: Cure. 24 hours minimum before vehicle traffic, 48 to 72 hours before re-striping.
Why Two Coats
Single-coat sealcoating is what you see on residential driveways and budget commercial work. Two coats provide proper opacity and depth, last longer, and look better. Industry-standard commercial sealcoating is two coats, full coverage, undiluted product.
How Often You Need It
Most commercial parking lots in Chicagoland need sealcoating every 2 to 3 years. High-traffic, salt-heavy, or sun-exposed lots may need it annually. The visual cue: when the surface starts looking gray or chalky, it’s time to recoat.
Cost vs. Benefit
Sealcoating costs cents per square foot. The pavement it protects costs dollars per square foot to install and replace. Done on the right cycle, sealcoating delivers the highest ROI of any pavement maintenance investment. Skipping it shortens pavement life by 50% or more.
When NOT to Sealcoat
Don’t sealcoat new asphalt for 6 to 12 months — let surface oils release first. Don’t sealcoat when more than 25 to 30% of the lot has alligator cracking or sub-base failure. Don’t sealcoat in cold weather (under 50°F) or on wet pavement.
Get a Free Commercial Paving Estimate
Need help with a commercial paving project? Every estimate is free, on-site, and itemized. Most on-site estimate within 48 hours, with on-site estimate within 48 hours. Use the form on this page or call request a free estimate.
Get a Free Commercial Paving Estimate
Need help with a commercial paving project? Every estimate is free, on-site, and itemized. Use the form on this page or call request a free estimate.