Hot tire pickup: warning signs

Hot tire pickup announces itself with four dull, tire-shaped patches where the car sits, and a rough edge that catches a fingernail. The distinction that matters is between a mark on the film and a missing piece of it: a stain cleans up, pickup leaves a shallow crater with the base coat showing through, and it gets worse every time the car parks in the same spot.

The first sign: dull patches in the parking position

A healthy topcoat has an even sheen. A floor developing hot tire pickup shows a matte, slightly grey patch exactly where a tire rests, usually in a rectangle matching the wheelbase.

At this stage the film is still there but the surface has softened and lost its gloss. The patch may look like dust or a scuff, and it often wipes clean and then returns within a week.

Photograph it with a light held at a low angle. A dull patch that has a defined tire outline is the earliest reliable sign.

The confirming sign: film on the tread

The clearest evidence is on the car. Look at the tread of a tire that has been parked on the floor and then moved. A fine grey or colored residue in the tread grooves is coating that transferred.

That residue is the same material as the floor. If the floor is grey and the tire tread holds grey dust, the film is lifting.

This check is worth doing once a month in the first summer after an install, because it catches the problem before the patch becomes a crater.

Stage-by-stage progression

Stages 1 and 2 are recoverable with a recoat. Stages 3 and 4 need a spot repair. Stage 5 means the base has failed and the floor needs grinding.

Telling it apart from other marks

Oil and transmission fluid leave dark stains that sit on the surface and spread slowly. They clean up with a degreaser, and the film underneath is intact.

Scuffs from shoes, grit, or dragged objects are shallow lines that follow the direction of travel. They are lighter than the surrounding floor and do not have a tire outline.

Efflorescence appears as white, chalky bloom, usually near walls or cracks, and it wipes away as powder. It is moisture moving through the slab, not a coating failure, though it often signals the moisture problem that later causes pickup.

Rubber transfer is a different thing again: a black mark left by a tire sliding, which sits on top of the film and can be cleaned. Pickup removes film rather than adding rubber.

Why it appears when it does

Timing is diagnostic. Marks that appear within the first month point to a cure problem: the car was parked before the topcoat cross-linked. A floor that was parked on at 24 hours in cool weather can show pickup even with a good urethane clear, because the film never reached full hardness.

Marks that appear after the first full summer point to heat resistance: the topcoat is a standard epoxy clear rather than a urethane, or it was applied too thin.

Marks that appear after several years point to wear: the film has thinned in the traffic lanes and no longer has the thickness to resist heat.

Marks that appear along with bubbles or lifting elsewhere point to moisture in the slab, which weakens the bond under the whole system.

The inspection routine

1. Park the car in its usual position and mark the tire locations with tape.
2. Move the car and inspect those four areas under a low-angle light.
3. Run a fingernail across the edge of any dull patch; a lip means the film has lifted.
4. Check the tire treads for coating residue.
5. Tap around the patch with a coin; a hollow sound means the base has let go.
6. Note the date and the stage, so you can tell whether it is progressing.

Repeating this twice a year builds a record. A patch that stays at stage 1 for two years is cosmetic. One that moves from stage 1 to stage 3 in a season is a specification problem, and it is worth raising with the installer before the warranty period closes.

What to do at each stage

At stage 1, clean the area, confirm the cure time was respected, and consider a recoat before the next summer. At stage 2, plan the recoat within the year. At stage 3, spot repair the affected area and recoat the lanes. At stage 4, spot repair with a proper prime and topcoat. At stage 5, stop recoating and assess the base.

A soft patch that dents under a thumbnail is a cure or chemistry failure, not wear. That one should go back to the installer while the warranty is live.

For the repair sequence at each stage, see hot tire pickup repair options. For the costs, read the repair cost breakdown, and for the specification that prevents the problem, check how to prevent hot tire pickup.