Thermoplastic vs paint striping cost: three materials on the same lot

The calculator prices a linear foot of 4-inch line as material plus labor. Thermoplastic costs more on both counts in the calculator: a higher material rate and a higher labor rate for hot application. Blue and red markings for accessible spaces and fire lanes cost 35% more per foot in material than white or yellow, whichever material you choose.

The coverage column is how many feet of 4-inch line the calculator gets from one gallon. For thermoplastic it is a gallon-equivalent for planning, so check the coverage on the supplier's data sheet before you order.

Here is one lot priced three ways: a 100-stall restripe with 4 accessible spaces, 6 directional arrows, 4 stop bars, 200 feet of fire lane and 2 crosswalks, 4,544 linear feet in all. Only the material changes.

Oil-based paint adds about 11% to the job and thermoplastic adds about 89%. The paint line alone goes from $562 to $1,967, three and a half times as much, but the $325 mobilization and the $356 of stencils do not change, and neither does the surface prep. That is why the whole job never rises as fast as the line rate.

The gap depends on how much of the job is line footage. On the calculator's default 50-stall job, which has 2 accessible spaces, 4 arrows, 2 stop bars, 120 feet of fire lane and one crosswalk, the fixed costs are a bigger share and thermoplastic adds about 76%. On a 200-stall lot with 6 accessible spaces and no other markings, footage dominates and thermoplastic about doubles the price. The same happens on drive lanes: 2,000 feet of centerline and edge line with no stalls is almost twice as much in thermoplastic.

FHWA's Roadway Delineation Practices Handbook says agencies have reported that thermoplastic markings typically last 3 to 15 times longer than paint, and that the figure depends on how often the paint is replaced and on the thermoplastic specification. It puts the break-even point at three to six years: to pay for itself, a thermoplastic marking has to stay in place, with satisfactory retroreflectivity, for at least three to six years.

The same handbook lists the cautions. It recommends against thermoplastic on new portland cement concrete, with a one-year curing period first and a primer-sealer on concrete even after that. It says hydrocarbon-based thermoplastic should not be used for transverse markings such as crosswalks and stop bars, because oil drippings dissolve it, while alkyd-based thermoplastic performs well there. And because thermoplastic is long-lived and hard to remove, it advises against installing it on pavement that will be resurfaced soon after marking.

Two things temper those numbers for a parking lot. The handbook is from 1994 and draws mostly on highway experience, and wear in a parking lot, with slow turning traffic and parked cars, can be quite different. And the 2009 edition of the federal MUTCD says that marking materials should keep their specified color throughout their useful life; it does not rank one material over another. Oil-based and water-based paints vary by product, and this guide does not cite a life figure comparing them, so ask the contractor for the product data sheet and any warranty.

Divide the thermoplastic price by the water-based price and you get how many times longer thermoplastic has to last to cost the same over time, ignoring disruption and the cost of money. On the 100-stall lot that is $4,625 divided by $2,448, about 1.9. On the default 50-stall job it is about 1.8, and on 2,000 feet of drive lane lines it is about 2.0.

Set that against the lot's real history. If the lot has been restriped in paint on a regular cycle and nothing else will disturb the lines, a material that has to last about twice as long is a reasonable bet against the 3-to-15 range FHWA reports. If the lot is due for an overlay, a reconfiguration or a sealcoat schedule that will cover the lines, the extra money is likely to be paved or sealed over before it pays back.

Water-based paint is the calculator's default and the lowest price per restripe. It suits most retail, office and multifamily lots, lots on a regular sealcoat cycle and any lot whose layout may change. Federal rules also cap the VOC content of striping paint: 40 CFR part 59 sets a VOC limit of 150 grams per liter for traffic marking coatings and 450 grams per liter for zone marking coatings, which are striping coatings for driveways, parking lots, sidewalks and curbs sold in containers of 5 gallons or less. State or local air rules can be stricter, so check what is allowed where the lot is.

Oil-based paint costs about 10% to 14% more on the full jobs above. Thermoplastic belongs where traffic is concentrated and the layout is settled: drive lanes, entrance and exit lanes, and crosswalks and stop bars in an alkyd-based product. Some lots mix the two, with paint in the stalls and thermoplastic on the drive lane markings. If you do, ask for each material as its own line so the bids compare cleanly.