The short version
- Paint is cheaper, faster, easier to remove and suits most car park work.
- Thermoplastic costs more, lasts far longer, is trafficable almost immediately and suits high wear areas and roads.
Most sites end up using both, and treating this as an either-or question is the main mistake people make.
Cost
Thermoplastic costs substantially more per metre, both because the material is more expensive and because applying it hot needs a boiler, more equipment and a larger crew.
The comparison people should be making is cost per year rather than cost per metre. If paint on an entry lane needs redoing every eighteen months and thermoplastic lasts several years, the thermoplastic can be cheaper over the life of the surface even at three times the install price. On a quiet bay line that gets almost no wear, the opposite is true and the extra buys you nothing.
The other cost that gets forgotten is mobilisation. Coming back to redo a worn entry lane in two years costs more than the paint, because someone has to bring a crew and manage the site again.
Life and wear
Wear is not evenly distributed across a site, and that is the whole basis for the decision.
On a typical car park, every vehicle crosses the entry line, the exit line and the main aisle arrows. Only a fraction of them touch any given bay line. So the entry can be worn to nothing while the bay lines still look reasonable, which is exactly the pattern you see on any older commercial car park.
Turning is harder on marking than straight running, because tyres scrub sideways. Roundabouts, turning circles, tight corners and loading dock aprons wear fastest of all. Braking areas, stop bars and give way lines are next.
Removal
This is the factor people forget until it bites.
Thermoplastic is far harder to remove than paint because there is much more material. If there is any realistic chance the layout will change, in a leased tenancy, a site being redeveloped, or a car park whose bay count keeps being revisited, thermoplastic makes that future change significantly more expensive.
Paint on a changing layout is not a compromise, it is the correct choice.
Cure time and reopening
Here thermoplastic wins clearly. It is trafficable almost as soon as it cools, often within minutes, whereas paint needs hours depending on temperature and humidity.
On the Sunshine Coast that matters more than it might elsewhere. Summer humidity slows paint noticeably, and on a live retail or hospitality site the difference between reopening in ten minutes and reopening in four hours can be worth more than the material cost difference.
Surface
Thermoplastic needs a sound surface to bond to. On old, oxidised or crumbling asphalt it can eventually fail by taking the surface with it, which leaves a worse problem than a worn line. A primer or sealer is sometimes used, but on a genuinely degraded surface the honest answer is that the surface needs attention first.
Paint is more forgiving on marginal surfaces, though it will not last as long on them either.
On interior concrete floors, neither of these is usually the answer. Warehouse and factory floors typically use two pack epoxy or polyurethane systems, or tape.
A practical split
| Area | Usually | Why |
|---|---|---|
| Entry and exit | Thermoplastic | Every vehicle crosses it |
| Directional arrows | Thermoplastic | High wear, high visual importance |
| Stop and give way bars | Thermoplastic | Braking concentrates wear |
| Roundabouts, turning circles | Thermoplastic | Sideways tyre scrub |
| Bay lines | Paint | Low traffic across the line itself |
| Hatching | Paint | Vehicles should not be on it at all |
| Accessible bays | Paint | Layouts get corrected, and thickness matters near a path of travel |
| Roads | Thermoplastic | Speed, volume and night retroreflectivity |
| Temporary or changing layouts | Paint | Removal cost |
Worth asking any contractor to quote a split rather than a single material for the whole site. If the answer is that they only do one, that is useful information.