Timber›SWMS

Spray Finishing — Timber SWMS

Spray finishing in the timber industry involves application of polyurethane lacquers, nitrocellulose lacquers, solvent-based stains, water-based coatings, and two-pack catalysed finishes — each with distinct chemical hazards and fire risks. Two-pack polyurethane finishes contain isocyanate hardeners identical to those in automotive two-pack paint, requiring the same supplied-air RPE and health surveillance programs. Nitrocellulose lacquers are extremely flammable and generate explosive vapour concentrations during application. This template covers all timber spray finishing operations with controls mapped to the binding Spray Painting and Powder Coating Code effective 1 July 2026.

Legal Requirements

regulation

WHS Regulation 2025 Part 7.1 — Hazardous Chemicals; AS/NZS 4114 Spray Painting Booths

hrcw category

Work in a contaminated or flammable atmosphere

code of practice

Spray Painting and Powder Coating (binding 1 July 2026 under Section 26A)

section 26a binding

Yes — Spray Painting code binding July 2026. Non-compliance is a standalone offence.

Hazards

Hazard	Consequence	Likelihood
Isocyanate exposure from two-pack polyurethane finish application	Occupational asthma (irreversible), respiratory sensitisation	Likely
Solvent vapour inhalation from lacquers and stains	CNS depression, liver damage, chronic neurological effects	Likely
Fire and explosion from nitrocellulose and solvent-based product application	Burns, explosion, fatality	Possible
Overspray particulate inhalation	Respiratory irritation, paint particle accumulation	Possible
Skin sensitisation from epoxy and polyurethane product contact	Contact dermatitis, systemic sensitisation	Possible

Controls (Hierarchy of Controls)

Conduct all spray finishing inside a compliant spray booth meeting AS/NZS 4114 requirements

Provide supplied-air RPE for all two-pack polyurethane finish application

Provide organic vapour respirator with P2 pre-filter for solvent-based finishes

Ensure booth electrical fittings are explosion-proof rated for flammable solvent use

Maintain health surveillance with spirometry for all workers applying isocyanate-containing finishes

Store nitrocellulose and flammable finishing products in compliant hazardous goods store

Install automatic fire suppression in spray booth and finishing area

Recent Prosecutions

SafeWork NSW v Furniture Finisher$150,000

Workers applied two-pack polyurethane finish in makeshift spray area without booth, supplied-air RPE, or health monitoring. Multiple workers reported respiratory symptoms consistent with isocyanate sensitisation.

2024 — SafeWork NSW Prosecution Database

What Your SWMS Must Include

✓RPE selection matrix for each finishing product type (isocyanate vs solvent vs water-based)

✓Spray booth airflow verification procedure for each finishing session

✓Health surveillance schedule for isocyanate-exposed finishing workers

✓Flammable goods storage requirements for finishing products

✓Fire suppression system testing and maintenance schedule

Need a compliant Spray Finishing SWMS?

Our WHS consultants develop timber finishing SWMS with RPE selection matrices and booth compliance protocols.