7 Driveway Sealing Mistakes to Avoid

Reviewed and updated October 6, 2026.

A sound sealing plan specifies the surface, preparation, product, application conditions and access arrangements. These seven checks help you assess a DIY plan or compare a contractor's scope without relying on invented failure rates or guaranteed repair prices.

1. Treating preparation as an optional extra

Inspect the driveway before agreeing the work. Identify loose debris, vegetation, damaged areas and existing coatings. Ask what will be cleaned, what will be repaired and what remains outside the sealing scope.

Choose cleaning methods suitable for the surface and the product system. Do not assume every driveway needs aggressive pressure washing or an identical 24–48-hour drying delay. The required surface condition should come from the selected sealer's instructions.

2. Expecting the sealer to hide an oil problem

Mark stained areas during the assessment. Ask whether cleaning, an approved spot treatment or pavement repair is proposed. The plan should distinguish a remaining colour stain from material that is still soft or contaminated. Applying an extra layer is not a diagnosis.

Use compatible cleaning and treatment products. If a contractor proposes a primer, ask for its name and compatibility with the sealer. Do not promise that every oil mark will disappear.

3. Booking by month without checking the forecast

A fixed Ontario season does not guarantee suitable conditions on a specific day. Check surface and air temperatures, overnight lows, rain restrictions and the required time before traffic. Include shaded areas in the assessment.

The HE200 technical sheet excludes rain, frost and sub-10°C forecasts within 48 hours of application. Use that as an example of a product-specific restriction, not a universal limit for all sealers. See our weather-planning guide.

4. Assuming two coats always beat one

The same HE200 sheet limits application to one coat and warns against excessive thickness. Black Jack's guidance describes thin coats and product-dependent recoating conditions. These examples contradict an across-the-board two-coat rule.

A useful quote identifies the product and application specification. Compare that information alongside price rather than choosing the largest number of coats. Confirm whether an existing coating affects the proposal.

5. Treating coating as a substitute for repair

List cracks, holes, settlement and drainage concerns separately. A sealer's stated ability to fill minor surface cracks is not a promise to repair structural damage. Ask which repair material will be used and when it can be coated.

Do not substitute a generic crack-width threshold for the instructions of the repair product and sealer. Keep repair inclusions in writing so that two quotes can be compared on the same basis.

6. Choosing a coating by colour instead of compatibility

Confirm whether the surface is asphalt, concrete or paving stones. Identify previous treatments where possible. Do not apply an asphalt product to concrete or assume a concrete treatment is harmless on another material.

If the existing coating is unknown, tell the contractor. Product compatibility and condition matter when deciding whether preparation, testing or a different approach is needed. Read our asphalt-versus-concrete guide for the distinction.

7. Reopening without clear instructions

Arrange parking, deliveries and pedestrian access before application. Record when the last coat was completed and obtain separate walking and driving instructions. If the surface remains tacky, contact the installer instead of relying on a countdown alone.

Our access-after-sealing guide explains the different drying milestones. If this is new pavement, also check first-seal timing.

Questions to resolve before accepting a quote

How much does D&D driveway sealing start at?

D&D's current driveway-sealing starting price is $450. The property, preparation and included repairs determine the final quote; this is not an Ontario market average.

Is two-coat sealing always better?

No. Follow the specified product's coat count and coverage requirements. Some products limit application to one coat.

What should the written scope include?

Ask for the surface area, product, cleaning and repair inclusions, application specification, weather requirements and access instructions. Confirm exclusions as well as the price.

Use our cost and scope guide to prepare the details for a driveway-sealing quote.

Devon Moore, Operations LeadCo-Founder & Operations Lead, D&D Home Services

Devon Moore is the co-founder and Operations Lead at D&D Home Services, with hands-on experience cleaning hundreds of homes across Kitchener-Waterloo, Cambridge, and Guelph.