Property managers often ask whether a parking lot needs crack sealing or sealcoating. Sometimes the answer is both—but the order and pavement condition matter. Start with the complete Parking Lot Maintenance Guide for Property Managers if you are building a broader maintenance plan.
The Simple Difference
Crack sealing addresses openings in asphalt. Sealcoating addresses oxidation and surface wear. Crack sealing protects from the inside out by reducing water intrusion. Sealcoat protects from the outside in by shielding a sound surface.
What Crack Sealing Does
Crack sealing cleans and closes active cracks with flexible material. Its purpose is to keep water from reaching the aggregate base, where support loss can turn a narrow crack into connected cracking, potholes, and structural repair.
- Reduces water infiltration
- Slows crack growth
- Protects stable surrounding pavement
- Extends the preventive-maintenance window
It works best when cracks remain isolated and the pavement still has useful life. It is not effective as a structural cure for widespread alligator cracking.
What Sealcoating Does
Sealcoat is a surface treatment that can slow oxidation, reduce UV exposure, improve appearance, and protect healthy asphalt from minor weathering. Those benefits are real when the underlying pavement is a good candidate.
What Sealcoat Does Not Do
- Repair potholes or failed base
- Close significant active cracks correctly
- Correct standing water or grade
- Repair alligator cracking
- Restore structurally failed pavement
A failing parking lot will still be failing after sealcoat. It will simply be black. Read When Sealcoat Is a Waste of Money before treating appearance as condition.
Which Comes First?
- Correct drainage and remove failed areas.
- Complete structural patches.
- Clean and seal appropriate cracks.
- Apply sealcoat only if the surface is still worth preserving.
- Restripe after curing and accessibility review.
When Neither Treatment Makes Sense
Neither is the right answer when the lot has severe alligator cracking, extensive potholes, widespread settlement, repeated base failures, or unresolved drainage. Those conditions belong in a patch, overlay, or replacement discussion.
Use Parking Lot Repairs: Patch, Overlay, or Replace? and read Drainage Problems That Destroy Asphalt.
A Practical Site-Walk Test
If you see open cracks, ponding, connected cracking, potholes, or repeated failures, do not begin with “Do we need sealcoat?” Begin with “What is causing deterioration, and is this pavement still in the preservation stage?”
Frequently Asked Questions
Is crack sealing worth it?
It is often one of the highest-return preventive activities when cracks are treated before structural failure develops.
Can you sealcoat over cracks?
Active cracks should be evaluated and properly treated before sealcoat. Sealcoat itself is not a crack repair.
How often should a parking lot be sealcoated?
Timing depends on traffic, climate, product, and pavement condition. Do not follow a calendar without inspecting the lot.
Can sealcoat fix alligator cracking?
No. Alligator cracking usually signals structural distress that needs repair below the surface.