Parking Lot Sealcoating in Duluth, MN

Parking lot sealcoating puts the kind of protective film a driveway gets onto commercial pavement, usually sprayed from a rig and squeegeed in, and the Duluth difficulty is fitting a whole lot between the May and September frosts without shutting the business. Lots take harder wear than driveways: plow blades, heavy spreads of sand and salt for customer safety, and turning traffic at every entrance. Minnesota's coal-tar ban applies to lots just as it does to driveways, which matters when runoff drains toward one of the city's 16 designated trout streams. Restriping usually follows the coat and is covered on the line striping page.

Lots are sealed in sections so part of the parking stays open. A common plan closes half the lot after business hours, cleans and seals it, reopens it after cure, and then does the other half. SealMaster's specification is two coats, an optional third on entrances, exits and drive lanes, and a day of cure after the last pass before traffic. Cool, damp lake weather stretches that cure time, which is why July and August are the easiest months to phase a large lot.

Duluth's storm utility fee is calculated on impervious surface, and a parking lot is about as impervious as a property gets. Runoff from it enters the same system of 415 miles of pipe and 11,204 catch basins that feeds the city's 44 named streams. MPCA traces 67 percent of the PAHs found in stormwater-pond sediment to coal-tar sealcoat and says those products can hold as much as 1,000 times the PAH content of asphalt-based sealers. Asking for the sealer's data sheet confirms what is going down.

For lots across the bridge in Superior, Wisconsin rules apply. There is no statewide coal-tar ban there, and the national list of local bans kept by Coal Tar Free USA includes Ashland but not Superior, so the product choice rests with the owner. Superior does require a stormwater management permit when a project disturbs an acre or more or adds 20,000 square feet of new impervious surface, which comes into play when a lot is expanded or rebuilt rather than simply sealed.

Prices run by the square foot. FixAsphalt quotes sealer alone at $0.20 to $0.50, and a package that also covers the cracks and the lines at up to $0.90, while Angi's 2026 range for sealing a lot is lower, $0.14 to $0.25. For scale, FixAsphalt treats 4,000 to 7,000 square feet as a small lot and prices one at about $1,200 to $2,100. The cost page sets these beside the driveway and repair ranges.