Dark tire-shaped marks on a garage floor can be three different problems: the coating can physically lift from the concrete, the topcoat can soften or transfer, or tire compounds can discolor an otherwise bonded coating. Those failures look similar from a few feet away but point to different causes and repairs.
1. True Hot-Tire Pickup or Adhesion Failure
If material sticks to the tire and leaves bare concrete or a lower layer behind, first determine where the failure occurred. Concrete attached to the underside of the coating suggests the substrate itself failed. Clean concrete with the entire coating stack gone suggests adhesion/preparation. One layer separating from another suggests an intercoat problem or missed recoat window.
Heat at the tire contact patch can stress a marginal coating, but “hot tires” should not become an excuse for a system that was not designed for vehicle service. Rust-Oleum explicitly markets EpoxyShield against hot-tire pickup, while Sika describes Sikafloor 515 as having enhanced resistance to tire marking. Product-specific claims therefore matter.
2. Tire Staining or Plasticizer Migration
A coating can remain firmly bonded yet develop brown, gray or black tire-shaped discoloration. Some tire compounds can migrate into or react with a clear or pigmented coating, particularly under warm contact. That is visually objectionable but is not the same as the coating peeling off the slab.
3. Delamination Caused by the Slab or an Old Sealer
A garage previously treated with a penetrating or film-forming sealer may not profile or absorb uniformly. Acid etching can make concrete look cleaner without removing every incompatible material. If water beads in some areas or grinding exposes a different surface beneath, the existing treatment needs to be addressed before recoating.
What to Document Before a Repair
- Photograph the tire marks and underside of any peeled chip.
- Identify which layer released.
- Ask for the original product numbers and coverage rates.
- Ask how the slab was profiled and whether an old sealer was found.
- Review moisture test results and cure time before vehicle traffic.
- Do not let a repair simply bury loose material under another clear coat.