Parking Lot Resealing: When to Do It and What to Expect

Resealing asphalt extends pavement life significantly. Here's a complete guide to parking lot resealing for commercial property owners.

Parking Lot Maintenance Overview

Asphalt oxidizes over time. Exposure to UV radiation, fuel spills, and water infiltration breaks down the binder that holds aggregate together, causing the surface to become brittle and grey.

Resealing — applying a coal tar or asphalt emulsion sealer — replenishes surface protection and extends pavement life. Properly maintained asphalt can last 25-30 years; neglected surfaces need replacement in 15.

Why Regular Maintenance Matters

The ideal resealing window is after 3-5 years on new asphalt, then every 3-4 years thereafter. Resealing too frequently wastes money; waiting too long allows oxidation and cracking to advance.

Before resealing, existing cracks must be cleaned and filled. Applying sealer over open cracks traps water and accelerates deterioration beneath the sealer layer.

Budgeting: What Resealing Costs in Ontario

Commercial sealcoating in southwestern Ontario typically runs $0.25–$0.60 per square foot depending on lot size, condition, and the number of coats, with crack filling priced separately at roughly $1–$3 per linear foot. A 50-stall plaza lot generally lands in the $3,000–$7,000 range as a complete project including re-striping — small money against the $4–$8 per square foot cost of replacement paving.

Beware per-square-foot quotes that exclude preparation. Cleaning, crack treatment, and oil-spot priming are what make sealer adhere; a quote that skips them is buying you a black lot for one season, not protection for three.

Budget resealing as a recurring line on a 3–4 year cycle, phased across large properties so the cost lands evenly. Our asphalt maintenance calendar shows where sealing fits in the broader pavement program.

Choosing a Contractor and Avoiding Common Mistakes

Ask three questions of any sealcoating bid: what surface preparation is included, what material and application rate is specified (two thin coats outperform one heavy coat), and how traffic will be phased and protected during cure. Vague answers to any of these predict the most common failures — peeling, tracking into tenant spaces, and premature wear in drive lanes.

Verify insurance and references from comparable commercial properties, not residential driveways. Commercial work means phasing around tenants, overnight scheduling, and accessibility compliance at re-striping — a different discipline from driveway work, and one a commercial parking lot contractor handles as routine.

The most expensive mistake is sealing the wrong lot: sealer is preservation for structurally sound asphalt, not repair for failed asphalt. Alligatored, base-failed areas need cutting and patching first — sealer over structural failure just makes the failure black. An honest contractor will tell you which areas need repair before they will quote the seal.

Commercial Parking Solutions

The resealing process involves cleaning the surface, applying crack filler, allowing cure time, then applying sealer in one or two coats depending on surface condition.

Temperature and weather conditions matter. Sealer should not be applied below 10°C or when rain is forecast within 24 hours. The surface must be dry and free of standing water.

After resealing, allow 24-48 hours of cure time before allowing vehicle traffic. Re-line markings after sealer has fully cured for best adhesion and visibility.

Devon Moore, Operations Lead Co-Founder & Operations Lead — D&D Commercial Services

Devon Moore is the co-founder and Operations Lead at D&D Commercial Services, delivering professional commercial property maintenance across Waterloo Region.