Asphalt sealcoat film cross-section — professional two-coat vs. thin single consumer coat
Sealcoat is a sacrificial film over the asphalt binder. A pro two-coat job lays a full, sand-filled film; a thin single coat at the label rate is roughly half as thick and wears out sooner.
What this diagram shows
Two side-by-side cut sections of a sealed asphalt driveway over the same pavement of binder and aggregate, with arrows of UV, water, and oil hitting each from above. On the left a professional two-coat sealcoat lays a full, silica-sand-filled film that reseals every 2 to 3 years; on the right a single thin consumer coat spread to the label rate is a paint-thin film that wears through much sooner. Sealcoat is a sacrificial layer that protects the asphalt binder from UV, water, and oil, so a film about half as thick has far less to give up before the pavement is exposed — which is why a 400 to 500 square-foot-per-pail claim is optimistic.
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