Spray Painting COSHH assessment
Spray painting creates a fine mist of paint, solvents and - for two-pack products - isocyanates. It is a high-exposure activity that needs proper ventilation, RPE and control of the spray area.
The hazards
- Fine paint mist inhaled deep into the lungs
- Two-pack (2K) paints release isocyanates - asthma sensitisers
- Solvent vapour and fire risk
- Overspray affects others nearby
Who is at risk
Exposure routes
- Inhalation of mist and vapour
- Skin and eye contact
Health effects
- Occupational asthma (especially from isocyanates)
- Headaches and dizziness from solvents
- Skin and eye irritation
- Fire risk from vapour
Control measures (hierarchy of control)
Controls should be applied in order — eliminate or substitute first, then engineering controls, then PPE as the last line.
- Spray in a ventilated booth or room with LEV
- Air-fed breathing apparatus for isocyanate (2K) spraying
- Substitute for water-based or non-isocyanate products where possible
- Restrict access and set a clearance time after spraying
- Control ignition sources; store paint safely
PPE & RPE
- Air-fed breathing apparatus (2K) or appropriate respirator
- Spray overalls and gloves
- Eye protection
First aid
- Move to fresh air immediately and monitor breathing
- Get urgent medical help for anyone with breathing symptoms after isocyanate exposure
- Wash skin and irrigate eyes as needed
Workplace exposure limit (WEL)
Relevant legislation & guidance
Spray Painting COSHH FAQs
You need effective ventilation - a spray booth or room with LEV - and air-fed breathing apparatus, because two-pack paint mist contains isocyanates that cause occupational asthma. Cartridge masks alone are not enough for the full task.
It removes much of the solvent and, if non-isocyanate, the sensitiser risk - so substitution is a strong control. You still need to control the fine mist with ventilation and suitable RPE.
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