Updated and reviewed for practical accuracy on 20 July 2026.
Peeling, flaking, blistering or hollow-sounding epoxy indicates that part of the coating system is no longer performing as intended. The visible edge is a symptom, not always the full extent of the problem. A lasting repair starts by identifying where the separation occurs and why; applying fresh epoxy over an unresolved cause can hide the defect temporarily and make later removal harder.
Describe the failure before choosing a repair
- Peeling at an edge or tyre path: may involve local contamination, inadequate preparation, movement or an incompatible layer.
- Blisters or bubbles: can involve trapped air, vapour, moisture, application conditions or a reaction within the system.
- Coating attached to weak concrete: the bond may exceed the strength of the slab's surface layer, so concrete comes away with the coating.
- Separation between coating layers: can involve contamination, recoat timing, surface condition or product compatibility.
- Widespread hollow or loose areas: can mean the visible patch is part of a broader system failure.
Photograph the whole floor, close-ups, edges and any material attached to the back of a loose flake. Record when the problem appeared, whether it follows cracks or joints and what happened before the change.
Common conditions to investigate
Surface preparation and existing layers
Oil, tyre residue, curing compounds, sealers, dust, weak laitance, old paint and incompatible repairs can interfere with bonding. Mechanical preparation must create the profile and sound surface required by the selected system; a quick scuff or cleaning step is not automatically enough.
Moisture and water entry
Moisture moving through or reaching the slab can contribute to coating failure where the system is not designed for the condition. Check drainage, water entry, cracks, plumbing events, wet cleaning and the below-slab construction where known. A surface reading or one dry-looking day does not establish the long-term moisture condition.
Concrete condition and movement
Weak concrete, cracks, joints, spalling and movement need separate assessment. A rigid coating or patch should not be used to bridge an active joint or conceal a structural problem without an appropriate detail.
Product, mixing and application conditions
Incorrect mix ratio, incomplete mixing, contamination, application outside temperature or humidity limits, excessive film build, missed recoat preparation and incompatible layers can affect cure or adhesion. The batch and installation records help distinguish a product issue from substrate or use conditions.
Use and exposure
Sunlight, hot tyres, vehicle fluids, chemicals, impact, abrasion and cleaning products affect systems differently. “High quality epoxy” is not a diagnosis. Compare the actual exposure with the complete installed system's current technical information.
Decide whether a local repair is appropriate
A local repair may be considered when the cause is identified and limited, the surrounding coating and concrete are demonstrably sound, the repair products are compatible and a visible transition is acceptable. A broader removal and replacement may be more appropriate when failure is widespread, the substrate is weak or contaminated, moisture remains unresolved, the existing system is unknown or local patches continue to fail.
Adhesion testing, moisture investigation or a trial removal area may be useful, but the method and interpretation should be selected for the project. Tapping or pulling loose flakes by hand is not a complete assessment.
Why grinding is not a casual DIY step
Grinding concrete and coatings can create hazardous dust and expose unknown older materials. Queensland's current crystalline-silica framework applies to mechanical processing of silica-containing materials. Workplace Health and Safety Queensland also provides asbestos guidance for suspected older flooring, backing, adhesive or related material.
Before ordinary preparation disturbs an unknown layer, identify what is present and which controls, licences or specialist services are required. Dust extraction, isolation, respiratory protection, electrical safety, noise and waste handling are part of the work method; a domestic vacuum or disposable mask should not be assumed sufficient.
A controlled repair sequence
- Inspect and map: record the extent, likely failure plane, substrate and operating conditions.
- Resolve the cause: address water entry, contamination, weak material, movement or incompatible layers before recoating.
- Define removal limits: remove failed material to a boundary where the remaining system and substrate meet the repair specification.
- Prepare safely: use the method, profile, containment and controls required for the substrate and new products.
- Repair the substrate: treat compatible cracks, defects and edges; do not bridge active joints without the specified detail.
- Apply a compatible build-up: follow current manufacturer instructions for primer, body coat, colour or flake and topcoat.
- Cure and inspect: maintain the required site conditions and check the repair before returning foot, vehicle, chemical or cleaning exposure.
A local patch may remain visible because the surrounding coating has aged, worn or changed colour. Agree the expected transition and whether a full recoating layer is required for appearance.
Information for an epoxy-failure assessment
- floor area, age and photographs of the whole floor and failure;
- known products, layers, installer records and warranty terms;
- existing slab, old coatings, contamination and moisture history;
- vehicle, tyre, chemical, sunlight, impact and cleaning exposure;
- cracks, joints, hollow areas and material attached to loose flakes; and
- access, occupied-area controls and acceptable shutdown.
Dynamic Concrete Solutions provides concrete floor preparation and epoxy and flake flooring for selected Brisbane projects. Request an epoxy-floor assessment with photographs, the affected area and any known product or moisture history.
This is general flooring information, not an engineering, hazardous-material, work-health-and-safety or product specification. Final investigation, removal, controls and repair must reflect the site, materials, current requirements and manufacturer instructions.