Sealcoating is a surface treatment. That sounds obvious, but it clears up most of the confusion around the job.
It can slow surface wear, fill small surface voids, and give weathered asphalt a more uniform appearance. It cannot rebuild a weak base, correct drainage, level a rut, or turn badly cracked pavement into sound pavement.
What a good sealcoat can do
On the right pavement, sealcoating can do 5 useful things:
- slow oxidation and surface raveling.
- reduce the amount of water entering small surface voids.
- create a more even, dark finish.
- provide a clean background for new parking lot markings.
- support a broader maintenance plan that also includes crack treatment and repairs.
The Asphalt Institute says sealing is useful when an older asphalt surface has become dry or brittle, develops small surface cracks or voids, or begins losing aggregate. That is a condition-based decision, not a promise that every blacktop surface needs another coat on a fixed schedule.
What it will not repair
Do not use a coating to hide a structural problem. Ask for a separate repair scope when you see any of these 6 conditions:
- alligator cracking, where connected cracks resemble scales.
- potholes or loose, broken edges.
- depressions that hold water.
- shoving, waves, or deep wheel-path ruts.
- movement around drains or utility cuts.
- areas that have already failed through repeated patching.
Those symptoms can point to failed asphalt, poor support underneath, drainage trouble, or traffic loads the pavement was not built to carry. A dark coating may make the lot look better for a short time, but the failure will keep moving.
Preparation is part of the job
A useful proposal should explain what happens before the sealer goes down. The surface normally needs to be clean and dry. Vegetation, dirt, loose aggregate, and oil-contaminated areas require attention. Cracks and failed spots should be identified as separate work.
Ask which repairs are included, which are excluded, and how long repaired materials must cure before coating. Also ask how the crew will protect doors, curbs, sidewalks, drains, landscaping, and vehicles from overspray or tracking.
Read the material and application details
The words “sealcoat driveway” are not a complete scope. Get the product type, number of coats, application method, estimated coverage, surface-preparation steps, and cure restrictions in writing.
More material is not automatically better. Uniform application on a properly prepared surface matters more than selling the thickest-sounding system. The contractor should also explain the weather window it needs and what happens if conditions change after scheduling.
The simple decision rule
Sealcoat pavement that is fundamentally sound but showing manageable surface aging. Repair isolated failures first. Evaluate widespread cracking, drainage problems, or movement before buying a cosmetic layer.
That sequence is less exciting than a one-product cure. It is also how you avoid paying to cover a problem instead of solving it.