Spray-On Concrete Driveway Coating SWMS

Spray-on concrete driveway coating involves the high-pressure application of polymer-modified cementitious overlays, acrylic sealers and oxide colour pigments onto existing concrete pavements to refresh appearance and improve durability. The work combines mechanical surface preparation (grinding, acid etching, pressure washing) with airless or hopper-gun spraying of hazardous chemical products at pressures often exceeding 200 bar. Under WHS Regulation 2025 r291 this activity meets the definition of High Risk Construction Work because it involves use of hazardous chemicals, work on or adjacent to trafficked areas, and powered spray equipment capable of fluid injection injury. A Safe Work Method Statement is mandatory before work commences, must be developed in consultation with workers under s47, and must be kept available for inspection for the duration of the project. This SWMS addresses the chemical, mechanical and slip hazards specific to driveway resurfacing across residential and light-commercial sites.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where existing concrete is structurally sound and aesthetically acceptable, eliminate spray coating by recommending diamond polishing or mechanical resurfacing as alternative scope.
2. 2Elimination — Schedule spraying during low-traffic periods and fully close the driveway approach with hard barriers, eliminating worker exposure to live vehicle movements during application.
3. 3Substitution — Substitute hydrochloric acid etchants with proprietary low-pH citric-based surface profilers (pH 2-3) to reduce acute burn severity and respiratory irritation potential.
4. 4Substitution — Use pre-tinted water-based acrylic sealers with low VOC content (<50 g/L) in place of solvent-based xylene/MEK formulations exceeding workplace exposure standards.
5. 5Engineering — Operate dust extraction (H-class vacuum or on-tool LEV) during all grinding and profiling per AS/NZS 60335.2.69 to maintain respirable silica below 0.05 mg/m³.
6. 6Engineering — Fit spray guns with tip guards, dead-man triggers and pressure relief valves; pressure-test hoses quarterly and tag out any hose showing abrasion or bulging.
7. 7Administrative — Conduct documented pre-start briefing using this SWMS, confirm SDS review for all chemical products, and verify each worker holds current chemical handling competency.
8. 8Administrative — Establish 1.8m exclusion zone around spraying operations using bunting and signage; post a dedicated traffic spotter at driveway/road interface in hi-vis.
9. 9PPE — Supply chemical splash goggles, nitrile gauntlets, Tyvek coveralls and P2 respirators for acid etching; upgrade to A2P2 cartridge respirators during sealer application.
10. 10PPE — Provide steel-cap rubber-soled boots with SRC slip rating, hi-vis Class D/N vests per AS/NZS 4602.1, and hearing protection (SLC80 22dB) during compressor operation.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

A two-person decorative concreting crew arrives at a suburban driveway resurfacing job — a 90m² existing slab requiring acid etch, base coat, colour spray and acrylic sealer over two days. Before unloading, the lead applicator opens this SWMS on a tablet and runs the pre-start brief at the tailgate. Working through the hazard register, the crew identifies that the driveway meets the road at an active suburban street, triggering the traffic-corridor control: they deploy bollards, bunting and a spotter vest before any equipment comes off the ute. The SDS for the citric etchant is cross-checked against the chemicals control row, and both workers sign the consultation page confirming respirator fit-test currency. Mid-morning, wind picks up to roughly 25 km/h, creating overspray drift toward the neighbouring property. The applicator pauses, refers back to the administrative control requiring spray suspension above 20 km/h sustained wind, and the crew amends the SWMS with a dated annotation noting the stop-work and revised sequencing — sealer application is rescheduled to early next morning. The signed SWMS, amendment note and SDS pack are filed in the job folder and retained for two years, satisfying r300 record-keeping duties and providing evidence of dynamic risk management if a regulator audits the site.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 3600 — Concrete structures

Frequently asked questions