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Spray Gun Cleaning SWMS

Spray gun cleaning exposes workers to concentrated solvent vapours during disassembly, flushing, and reassembly of spray equipment. Traditional open-pot cleaning methods generate vapour concentrations that can exceed workplace exposure limits for xylene, toluene, and MEK within minutes in a poorly ventilated area. Isocyanate residues in uncured paint within gun passages and cups present an additional respiratory hazard during cleaning. This template covers spray gun cleaning procedures with controls that prioritise enclosed gun washing systems and proper solvent waste management.

Legal Requirements

regulation

WHS Regulation 2025 Part 7.1 — Hazardous Chemicals; Environmental Protection Regulations — Waste Solvents

hrcw category

Work involving hazardous chemicals (solvents, isocyanate residues)

code of practice

Spray Painting and Powder Coating; Managing Risks of Hazardous Chemicals (binding 1 July 2026 under Section 26A)

section 26a binding

Yes — Spray Painting and Hazardous Chemicals codes binding July 2026.

Hazards

HazardConsequenceLikelihood
Solvent vapour inhalation during open-pot gun flushingCNS depression, headache, liver and kidney damageLikely
Isocyanate residue exposure when cleaning guns used for two-pack paintRespiratory sensitisation, occupational asthmaPossible
Skin absorption of solvents through unprotected handsDermatitis, systemic solvent absorptionLikely
Fire from solvent vapour ignition during cleaningBurns, explosionUnlikely
Environmental contamination from improper solvent waste disposalEPA prosecution, soil and water contaminationPossible

Controls (Hierarchy of Controls)

Use enclosed automatic gun washing system to eliminate open-pot solvent vapour exposure
Provide organic vapour respirator when enclosed washer is unavailable and manual cleaning is required
Require solvent-resistant gloves (nitrile minimum) during all gun cleaning operations
Treat all gun cleaning waste as hazardous waste and store in labelled, sealed containers for licensed disposal
Locate gun cleaning area in well-ventilated zone away from ignition sources
Recycle cleaning solvent through distillation unit where practicable to reduce waste volume
Clean guns immediately after use to prevent isocyanate residue curing inside passages

Recent Prosecutions

EPA NSW v Auto Body Workshop$150,000

Workshop disposed of waste solvent from gun cleaning into stormwater drain. Environmental investigation revealed soil and groundwater contamination requiring remediation.

2023 — EPA NSW Prosecution Database

What Your SWMS Must Include

✓Enclosed gun washer operating procedure and maintenance schedule
✓Manual cleaning procedure with ventilation and RPE requirements for backup use
✓Solvent waste classification, storage, and licensed disposal arrangements
✓PPE requirements — solvent-resistant gloves, eye protection, organic vapour RPE
✓Gun cleaning area housekeeping and ignition source exclusion requirements

Need a compliant Spray Gun Cleaning SWMS?

Our WHS consultants develop gun cleaning SWMS with enclosed washer protocols and waste solvent management procedures.

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