Sealcoat, Slurry Seal, or Microsurfacing: Are Your Quotes for the Same Work?
Do not treat sealcoating, slurry seal, and microsurfacing as interchangeable just because each proposal promises a refreshed asphalt surface. Ask each bidder to identify the treatment, materials, preparation, and reopening conditions in writing. Compare prices only after you understand whether the proposals describe the same work and address the same property concerns.
Start with the treatment name, not the finished color
A proposal that says only seal the lot leaves an important question unanswered: what will actually be installed? Caltrans groups several distinct processes under seal coats, including slurry seals, microsurfacing, and parking area seals. That terminology is useful evidence that a broad label alone does not define a scope. Its highway construction manual is not a specification for your private Tennessee parking lot.
For a property manager in Gallatin or Nashville, a practical first request is a revised line item identifying the proposed system and its product or mixture documentation. Keep the bidder's original terminology, then ask for a plain-language description beside it. Do not rename one proposal yourself simply to make a comparison sheet look consistent.
Understand two distinctions without designing the treatment
FHWA describes slurry seal as a thin surface treatment combining emulsified asphalt, water, fine aggregate, and mineral filler. It explicitly notes that slurry seals do not add structural benefit. A slurry-seal proposal therefore should not be read as a promise to rebuild a failing pavement merely because it includes aggregate.
Microsurfacing is related to slurry seal, but it is not just another spelling for the same work. Caltrans distinguishes its polymer-modified emulsion and setting behavior, and describes applications in multiple layers to address surface irregularities. These differences are reasons to ask which system is specified, not reasons to assume that microsurfacing is automatically the right purchase for every parking lot.
Keep the technical choice with the pavement professional reviewing your site. Your role as the owner is to make sure that the recommendation, its intended result, and its limits are recorded before approval. A familiar treatment name from a road project is not enough to select work for your property.
Build a comparison around five written answers
First, what exact area is included? Give every bidder the same marked plan, with entrances, parking rows, and excluded areas identified. Ask whether the quoted quantity covers the whole outlined surface or only selected portions. Keep any optional area separate from the base price.
Second, what happens before application? Request separate descriptions of cleaning, crack work, patching, and any other preparation. Third, what material and application scope are proposed? Ask for the product or mixture identification, planned passes or layers where applicable, and the documentation that defines the work. Do not assume a layer count means the same thing across different treatments.
Fourth, what will remain unresolved? Point out the puddle, depressed wheel path, or recurring damaged area that prompted the request and ask whether it is included, separately priced, or outside this treatment's purpose. Fifth, what is the operational handoff? Ask who authorizes reopening, what restrictions apply, and whether replacement striping is included or assigned to someone else.
Resolve substitutions before the crew arrives
If a bidder later proposes a different treatment, request an updated scope rather than accepting a verbal assurance that it is equivalent. Have the revision explain what changes in preparation, finished result, access planning, and price. Save the revised documents with the approval so the field crew and property staff are working from the same decision.
Milliken lists parking lot sealing and striping among its services. Send the competing treatment descriptions and your marked property plan when requesting a discussion. Confirm the specific system available for your project; the presence of sealcoating on a service page does not establish that slurry seal or microsurfacing is offered. The useful outcome is a clearly identified proposal, not a contest over which name sounds more advanced.
Frequently asked questions
Does a slurry seal replace an asphalt overlay?
Do not assume so. FHWA identifies slurry seal as a thin treatment without structural benefit. Ask the reviewer to explain why the proposed treatment fits the observed condition rather than substituting it for a different scope based on price alone.
Can I compare proposals by the number of coats?
Not until the treatment and materials are identified. Ask each bidder what its coat, pass, or layer means within that particular system, then compare the complete scope rather than the count by itself.
Does this mean Milliken offers every treatment described?
No. Milliken's current page lists sealcoating and striping. Ask the team to confirm the specific treatment and scope it can provide for your property before making a purchasing decision.