Coal-tar and asphalt-emulsion sealers are different product families; neither should be selected by color alone. Compare manufacturer specifications, local restrictions, surface compatibility, solids, application rate, weather window, cure time, odor and the property operating plan.
What determines the scope
Ask each bidder to name the proposed product and application rate. EPA resources discuss environmental concerns associated with coal-tar pavement sealants, and some jurisdictions restrict them, so current local rules must be checked.
What a commercial proposal should define
- Document existing failures and drainage.
- Define repair limits and depth assumptions.
- Plan access, closures and traffic control.
- Confirm jurisdiction and applicable requirements.
- Put materials and exclusions in the written scope.
How to compare bids
Compare the same repair boundaries, depths, materials, preparation, access plan and exclusions. A lower number is not a comparable bid when it assumes a thinner section, skips failed base, omits traffic control or leaves drainage and striping unresolved.
Related planning resources
Primary source: U.S. EPA pavement-sealant resources. Confirm the current rule and project-specific applicability with the authority having jurisdiction.
Property-manager action
Require bidders to identify the proposed product, application rate, restrictions, weather window and cure plan.
Frequently Asked Questions
What should be included in a Coal Tar Sealer vs Asphalt Emulsion for Parking Lots proposal?
The proposal should define repair limits, depth and material assumptions, preparation, traffic control, access, schedule conditions, exclusions and any connected drainage, concrete or striping work.
Can the work be completed while the property stays open?
Often it can be phased, but the workable plan depends on entrances, fire and accessible routes, deliveries, parking demand, cure or cooling time and the amount of safe staging space.
How do we know whether repair or replacement is appropriate?
The decision starts with the failure pattern and supporting conditions. Isolated sound areas may be preserved, while widespread movement, unstable base or drainage failure can require deeper correction.