The most cost-effective maintenance investment for any asphalt parking lot or driveway. A single seal coat extends pavement life 5–10 years by blocking UV rays, water infiltration, and petroleum-based damage.
LA's sun, heat, and traffic break down asphalt faster than almost anywhere in the country. Seal coating stops the damage before it starts.
Southern California's intense solar radiation oxidizes asphalt binder and causes surface raveling. Seal coating reflects UV rays and slows oxidation dramatically, the #1 cause of parking lot deterioration in LA County.
Water penetrates unsealed asphalt through micro-cracks, softening the base and triggering alligator cracking. Seal coat closes surface voids and creates a barrier against moisture intrusion and storm drain pooling.
Vehicle fuel and hydraulic fluid dissolve asphalt binder on contact. Coal-tar seal coating provides superior chemical resistance, essential for commercial parking lots with high vehicle turnover and delivery traffic.
Seal coating every 3–5 years costs a fraction of resurfacing or full-depth replacement. A parking lot that gets regular maintenance typically lasts 25–30 years. One neglected by 10 years often needs full replacement at 15.
Coal-tar sealer has been banned in California since 2013 under AB-1704 (Health & Safety Code §25250.70). Every licensed contractor in LA County uses asphalt emulsion — not by preference, by law. Here is how it performs in Southern California conditions.
| LA Condition | Emulsion Performance | Why It Matters Here |
|---|---|---|
| UV Index 11 (Extreme) — daily in summer | Refreshes surface oils, slows oxidation | LA averages 284+ sunny days/year — UV is the #1 cause of asphalt failure in SoCal |
| Temps exceeding 100°F (Valley & Inland) | Stable — does not soften or track onto tires | Heat stability matters in Van Nuys, Burbank, Woodland Hills, and Pomona in summer |
| SCAQMD Rule 1113 (VOC limits) | Fully compliant | Coal-tar products fail SCAQMD VOC standards independently of the statewide ban |
| LA stormwater / MS4 permit | Zero PAH runoff — fully compliant | Coal-tar runoff is a prohibited discharge under LAMC stormwater rules — significant liability for property owners |
| Coastal LA (Santa Monica, Long Beach, Torrance) | 3–5 year service life | Salt air + UV without extreme heat — longer intervals, lower annual cost |
| Valley & Inland (Van Nuys, Burbank, Pomona) | 2–3 year service life | Extreme thermal cycling accelerates oxidation — reseal on the shorter end |
| High-traffic commercial lots | 2–3 year service life | Mechanical wear and fuel/oil exposure shorten intervals regardless of climate zone |
Don't wait until cracks become potholes. These are the signs that seal coating should happen now, before more expensive repairs are required.
Fresh asphalt is nearly black. Gray or tan color indicates UV oxidation is well underway and the surface binder is breaking down.
Fine surface cracks are stage-one deterioration. Seal coating at this point closes them before water infiltration begins.
Loose aggregate stones on the pavement surface mean the binder is losing cohesion, an early warning sign before structural failure.
If your last seal coat was more than 3–5 years ago and you can't see the original black color, it's time. Don't wait for visual damage.
Puddling in the pavement surface indicates surface depressions forming, often early base movement that sealing can arrest if caught early.
Dark oil stains indicate active petroleum penetration into the asphalt binder, coal-tar sealing prevents further damage.
Common questions about seal coating in Los Angeles and Southern California.
Tell us your lot size and location. We respond within one business day. Weekend scheduling is available, most commercial jobs are done with zero business-day closure.