Road works on the coast: fresh tar on the paint and what the file needs

You drive through a stretch of resurfacing at the posted speed, and by evening the lower half of the car is covered in black dots that will not wash off. It is a common summer file on the coast, and it is decided almost entirely by what was photographed on the first day.

What bitumen spray actually does to the paint

It is not dirt, and treating it as dirt is what usually causes the second, larger part of the damage.

It bonds as it cools. Warm bitumen lands as a droplet and hardens onto the clear coat within hours. On a hot panel it stays soft longer and penetrates further into the surface texture.

Removal is where paint gets damaged. Scraping, aggressive solvents and close-range pressure washing take the clear coat with the deposit. Most cases that end badly were not lost on the road but in the car park afterwards.

The pattern is diagnostic. Spray from a passing vehicle covers the lower flanks and the arches; spray from a machine covers one side; driving over a freshly laid surface covers the underside and the sills. The distribution tells the story better than any statement.

The first day decides the file

Two sequences matter and both are quick.

• Photograph the vehicle before washing: whole panels first, then close-ups in raking light, with a scale next to a representative area
• Photograph the underside, the sills and the inner arches, which are usually worse than the flanks
• Photograph the road works: signage, the machine, the company name on it, the section and the direction of travel
• Report it in writing the same day to the contractor or the road operator, and keep the confirmation

Do not wash the car before that material exists. After a wash there is a damaged clear coat and no way to show what caused it, which turns a simple file into an argument about whether it happened at all.

Ask at the site rather than later. The contractor name and the section number are on the signs, and they stop being available the moment the works move on.

What an assessment can establish, and what it cannot

Depth, not appearance, decides the scope. Deposits sitting on the surface are removed and polished. Where the clear coat has been softened or already scraped, the panel is refinished. The difference is established with raking light, with a paint thickness gauge and by comparison with unaffected areas.

Old damage is separated from new. Edges, the state of exposed metal and the layering of deposits place a mark in time within limits, and those limits are stated in the report.

Glass, lights and plastics are their own group. Bitumen on a windscreen in the wiper path and on lamp lenses is not a polishing job, and unpainted plastics react differently to solvents than metal panels do.

What is outside our role. We do not decide whether the contractor or the road operator is liable, we do not assess cover under any policy and we do not determine what you are owed. Those belong to the parties, to the insurer and, in a dispute, to a recommended lawyer.

Frequently asked questions

The car is covered in black dots after driving past a resurfacing crew. Is that a claim?

It is at least a documented technical case, and whether anyone pays is a separate question. Photograph the vehicle before washing, photograph the works with the signage and the contractor name, note the section and the time, and report it in writing the same day.

Can I just take it to a car wash and use a tar remover?

Not before the photographs exist, and then carefully. Aggressive solvents and close-range pressure washing remove clear coat along with the bitumen, and the resulting damage is then indistinguishable from the original one. Where the deposit has hardened, the safe route is a controlled removal followed by an assessment of what is left.

Weeks have passed and the car has been washed. Is anything still possible?

Yes, but narrower. The condition of the clear coat, the pattern of the remaining marks and the thickness readings still describe the scope. What can no longer be shown is the substance itself, so the link to a particular road on a particular day must come from other evidence.