Technicians handle solvents, fuels and coatings every day, breathe engine exhaust in enclosed bays, and work on brake and clutch assemblies that may still contain asbestos. Many of these exposures cause no immediate symptoms, which makes them easy to underestimate. The effects, including dermatitis, respiratory sensitization, carbon monoxide poisoning and long-latency disease, can surface quickly or years later, and the resulting workers' compensation claims are among the hardest to defend and close.
This guide covers the main exposures in repair and collision shops, the controls that work, the specific OSHA rules that apply, and how insurance typically treats occupational illness.
Know the exposures in your shop
Solvents and cleaners
Aerosol brake and parts cleaners, degreasers and thinners can be inhaled or absorbed through skin. Some formulations contain chlorinated solvents that EPA now restricts.
Engine exhaust
Running engines indoors produces carbon monoxide, which is odorless and can build up in bays with poor ventilation.
Brake and clutch dust
Older and some aftermarket friction products may contain asbestos; OSHA treats brake and clutch work as an asbestos exposure unless proven otherwise.
Paints and coatings
Isocyanate-based clear coats and primers in collision repair can cause occupational asthma; sanding creates dust containing metals.
Fuels, oils and fluids
Gasoline, used motor oil and coolants cause skin irritation and dermatitis with repeated contact.
Corrosives
Battery acid and some wheel cleaners can cause eye and skin burns in seconds.
Start with your chemical inventory and safety data sheets (see our chemical storage guide and HazCom guide). Section 8 of each SDS lists exposure limits and recommended controls, including the glove material and respirator type the manufacturer recommends.
Use the hierarchy of controls, not just PPE
Gloves and respirators matter, but they are the last line of defense. The most reliable programs work from the top down.
| Control level | Shop examples |
|---|---|
| Eliminate or substitute | Water-based brake washers and parts cleaners in place of aerosol solvents; lower-hazard coatings where the paint system allows |
| Engineering controls | Tailpipe exhaust extraction hoses; general bay ventilation; properly maintained spray booths and prep stations; HEPA-filtered or wet brake cleaning equipment |
| Administrative controls | Written procedures, training, limiting time engines run indoors, keeping non-painters out of spray areas, no eating or drinking in bays |
| PPE | Chemical-resistant gloves chosen from the SDS, safety glasses and face shields, respirators selected for the specific hazard |
Quick win: collect every aerosol can in the shop for a week and read the labels. Many shops find they can standardize on a smaller number of lower-hazard products, which cuts both exposure and inventory.
Brake and clutch work: OSHA's asbestos rules
OSHA's asbestos standard includes a mandatory appendix (29 CFR 1910.1001, Appendix F) for automotive brake and clutch inspection, disassembly, repair and assembly. Employers must use one of the approved methods:
- Negative pressure enclosure with HEPA vacuum: the assembly is enclosed and kept under negative pressure while it is worked on.
- Low pressure/wet cleaning: a catch basin sits under the brake assembly and the assembly is gently flooded with water containing a wetting agent or solvent before parts are removed.
- An equivalent method that is documented and shown to produce exposures equal to or lower than the enclosure method.
- The wet method: parts are wetted with a fine mist or low-pressure water and wiped clean, permitted only in facilities that do no more than five pairs of brakes or five clutches per week.
Dry brushing is prohibited with the wet methods. Do not blow out drums or housings with compressed air outside an approved enclosure. Waste and used wiping cloths go into sealed, labeled containers, and spills of asbestos-containing waste must be cleaned up immediately.
Carbon monoxide and exhaust
OSHA's permissible exposure limit for carbon monoxide is 50 parts per million averaged over an eight-hour period. Early symptoms include headaches, dizziness, fatigue and nausea; high or prolonged exposure can cause confusion, collapse and loss of consciousness. OSHA recommends effective ventilation, maintaining fuel-burning equipment, prohibiting gasoline-powered engines and tools in poorly ventilated areas, and personal CO monitors with audible alarms where exposure is possible.
- Connect a tailpipe extraction hose before running any engine indoors, every time.
- Keep bay doors open when practical and service exhaust fans and hose reels on a schedule.
- Avoid propane forklifts and fuel-fired heaters in closed bays without adequate ventilation.
- Install fixed CO detection in enclosed service areas and test it.
- Teach technicians to report headaches or dizziness and to get to fresh air immediately.
Paint, solvents and respirators
OSHA's autobody repair resources identify isocyanates, solvents, sanding dust, crystalline silica and hexavalent chromium among the main refinishing hazards, and point to NIOSH control guidance such as HVLP spray guns, ventilated sanders and well-designed booths. Isocyanates are a recognized cause of occupational asthma, and once a worker is sensitized, even small exposures can trigger symptoms.
If anyone in your shop wears a respirator because of a hazard, OSHA's respiratory protection standard (29 CFR 1910.134) generally requires a written program, medical evaluation, fit testing, training and proper maintenance. In Washington, DOSH enforces its own respiratory protection rules. Respirator type should follow the coating manufacturer's SDS and a qualified assessment; filtering facepieces and dust masks are not appropriate for spraying isocyanate coatings.
EPA is also restricting some solvents under the Toxic Substances Control Act. Its December 2024 rule on trichloroethylene (TCE) prohibits all uses of the chemical, most on a phased schedule, and the rule remains under review in federal court. EPA has issued similar rules for other chlorinated solvents. Ask your suppliers to confirm that the brake cleaners and degreasers you buy are compliant, and favor non-chlorinated products.
Skin contact, eyes and hygiene
- Provide nitrile or other gloves matched to the chemicals in use; thin disposable gloves are not a substitute for chemical-resistant gloves during solvent work.
- Never let technicians wash hands with gasoline, thinner or parts-washer solvent; provide proper hand cleaners and washing facilities.
- Require safety glasses in the shop and face shields for battery work and pressurized fluids.
- Provide quick-drench eyewash and body flushing where corrosives are used, as OSHA's 29 CFR 1910.151(c) requires.
- Keep food, drinks and tobacco out of work areas and launder shop clothing separately.
How insurance treats chemical exposure
Occupational illness from chemical exposure is generally handled under workers' compensation, which in Washington is provided through the Department of Labor & Industries state fund or employer self-insurance. Disease claims can be filed long after the exposure and can involve extensive medical treatment and time-loss benefits, so documentation matters: keep training records, SDS access records, respirator program files and any exposure monitoring results.
Gaps appear at the edges. Employers in Washington typically need stop-gap (employer's liability) coverage for certain employee injury suits that fall outside the workers' compensation system. Exposures to customers or neighbors from your operations may fall under pollution exclusions in general liability policies. And fines are generally not insurable. Read more in our auto shop workers' comp claims guide and on our workers' compensation page, and see our PPE program guide for building a written program.
If you are adding a paint booth, changing coating systems or expanding service bays, talk to us before the change. As a broker, we compare options across the market, help you present your controls to underwriters and make sure stop-gap and pollution coverage are addressed.
Sources
- OSHA — 1910.1001 Appendix F, Automotive brake and clutch work
- OSHA — Carbon Monoxide Poisoning fact sheet
- OSHA — Autobody repair and refinishing: hazards and solutions
- EPA — Update on the status of the TSCA risk management rule for TCE
- OSHA — Requirements for eyewash and shower facilities (interpretation)
- OSHA — Negative pressure respirators unacceptable for isocyanate paints (interpretation)
- OSHA — 29 CFR 1910.1200, Hazard Communication