13.1 Wet Scraping, Chemical Removal, and Heat Guns Below 1100°F

Wet methods, chemicals, and heat guns are paint removal — not a torching loophole

Quick Answer: Paint removal is an abatement method under 40 CFR 745.223 when it is designed to permanently eliminate lead-based paint hazards. The allowed field methods in EPA and HUD training are wet scraping and wet sanding, chemical strippers used per the manufacturer and with ventilation, off-site stripping, heat guns below 1100°F, and HEPA-shrouded power tools. 745.227(e)(6)(iv) permits a heat gun on LBP only at temperatures below 1100 degrees Fahrenheit. 745.227(e)(6)(iii) permits dry scraping only in conjunction with heat guns, around electrical outlets, or when treating defective paint spots totaling no more than 2 square feet in any one room, hallway or stairwell or no more than 20 square feet on exterior surfaces. Chemical sludge is a waste stream (Chapter 17). Heat guns still create fumes — OSHA respiratory protection under 29 CFR 1926.62 may apply.

Chapter 12 took the component out or covered it. This chapter takes the film off a component that is staying. Removal is still abatement. Containment (Chapters 10–11), restricted practices in 745.227(e)(6) (Section 13.2), cleanup (Chapter 14), independent clearance, and a method reason in the abatement report (Section 13.3) all still apply. Do not sell removal as a lighter rule because the sash is not leaving the opening.

This is not interim paint stabilization. Wet-scraping loose paint and recoating with ordinary latex so the film is intact for now is Chapter 5's temporary control. Wet-scraping, chemically stripping, or heat-gunning to remove LBP as the permanent method, then finishing the remaining substrate, is paint-removal abatement. The scraper in the worker's hand does not choose the rule. The design and the report do.

Allowed removal methods — what the crew actually does

Worked example — living-room wainscot. The risk assessment identifies high-lead wainscot the owner wants stripped to historic wood, not replaced. Methods: (1) replacement — complete but destroys the millwork; (2) encapsulant — hides the grain the owner wants shown; (3) wet-scrape, chemical, and/or heat gun below 1100°F on the wainscot, with containment, then a lead-free finish. (3) is paint-removal abatement. Restricted practices still apply. Clearance still happens. Interior dust-lead action levels on or after January 12, 2026 remain 5 / 40 / 100 µg/ft² (floors / interior sills / troughs).

Wet scraping and wet sanding — keep the film wet, not the circuit

Wet methods exist because dry mechanical work turns LBP into airborne and settleable dust. HUD Guidelines Chapter 12, used as a documented methodology under 745.227(a)(3), treats wet scraping and wet sanding as the ordinary on-site hand methods: mist the surface, keep the film wet, scrape or sand the wetted film, keep debris on the poly, and HEPA-vacuum continuously rather than dry-sweeping chips into the room.

Do not confuse wet with soaked. Over-wetting plaster, gypsum, or unsealed wood drives leaded slurry into pores and can wreck the substrate you meant to save. Do not mist live electrical. De-energize circuits in the work area when you can — Chapter 12 already taught that for replacement. When you cannot wet near a receptacle, 745.227(e)(6)(iii) is the legal path: dry scraping is permitted around electrical outlets. That is a narrow exception, not a license to dry-scrape the whole wall because one outlet is on it.

Wet sanding is still sanding. Hand sanding a wetted film with wet/dry paper is the training picture. Putting a power sander on LBP is machine sanding under 745.227(e)(6)(ii). Misting the wall does not convert an uncontained belt sander into wet sanding. If the tool is a machine sander, grinder, needle gun, or blaster, it needs HEPA exhaust control (Section 13.2). A spray bottle in the other hand is not that control.

Worked example — outlet on a dining-room wall. The crew will wet-scrape about 80 ft² of LBP dining-room plaster. One duplex receptacle sits in the field. They de-energize what they can, wet-scrape the wall, and dry-scrape only the paint immediately around the outlet so water does not enter the box. That matches (e)(6)(iii). Dry-scraping the entire dining room because of the outlet does not.

HUD's Lead Safe Housing Rule, 24 CFR 35.140(e), uses the same 2 ft² / 20 ft² idea and measures the outlet exception as within 1.0 ft (0.30 m) of electrical outlets. Attribute that one-foot distance to HUD, not as extra words inside EPA 745.227(e)(6)(iii), which says around electrical outlets without a numeric radius. On a HUD-assisted job, obey both.

Chemical removal — manufacturer, ventilation, sludge

Chemical strippers (caustic pastes, solvent gels, peel-away systems) can take film off carved millwork and historic sash that you cannot save with a scraper alone. They do not suspend 745.227. You still contain the room. You still keep open flame off the job. You still treat residue as leaded waste.

1. Read the manufacturer's instructions for dwell time, number of applications, neutralization, and PPE. The label is part of the method.
2. Ventilate. Volatile strippers in a closed room are a chemical-exposure problem and, on HUD-assisted housing, a prohibited method if the space is poorly ventilated (24 CFR 35.140(f) — a volatile stripper that is a CPSC hazardous substance and/or an OSHA hazardous chemical). That HUD sentence is not a fifth EPA (e)(6) bullet. EPA still expects the certified supervisor and firm to follow all other Federal, State and local requirements (745.227(e)(3)), including OSHA.
3. Lift sludge onto poly, bag or drum it, and send it into the Chapter 17 waste path. Chemical sludge is a waste stream. Do not wash it into soil, a floor drain, or a storm inlet. TCLP / D008 and the household-exclusion analysis live in Chapter 17; residential versus non-residential still matters; states may be stricter.
4. Off-site stripping is often cleaner for doors, shutters, and railings: wrap the piece (Chapter 12), tell the stripper that LBP is present, recover a bare component, and reinstall only after it is clean. Off-site does not let you skip wrapping on the way out or dump chips in the parking lot.

Worked example — solvent gel in a closed parlor. The crew applies a volatile solvent gel in a parlor with the windows shut so the gel does not dry. On a HUD-assisted unit, 35.140(f) prohibits that poorly ventilated volatile strip. Open windows, run mechanical ventilation that does not blow leaded air into occupied space, or take the component off-site. Do not invent an EPA (e)(6) chemical exception.

Heat guns below 1100°F — temperature control, not torching

745.227(e)(6)(iv): operating a heat gun on LBP is permitted only at temperatures below 1100 degrees Fahrenheit.

That number is a hard cap, not a target. Set the tool below 1100°F and verify. A gun whose high setting exceeds 1100°F is not close enough because the operator usually keeps it moving. Open-flame burning or torching is prohibited ((e)(6)(i)) — a propane torch, a heat plate that flames, or burning the film to ash is not a heat gun. An infrared heater or a heat gun held below 1100°F is not torching. Do not merge the torch ban with the heat-gun temperature cap.

Heat still makes fumes. Lead and organic pyrolysis products can be inhaled even when the film never flames. OSHA 29 CFR 1926.62 still applies: exposure assessment, PEL 50 µg/m³ 8-hour TWA, action level 30 µg/m³, and respiratory protection when required. A heat-gun task is not hand work, so no respirator. HUD 35.140(d) also prohibits heat guns above 1100°F or charring the paint. Charring is the HUD extra; do not add charring as an EPA (e)(6) fifth item, and do not char the film on any job.

Field controls for a legal heat-gun pass:

1. Confirm the indicated temperature stays below 1100°F. If the tool's high setting is 1400°F, do not use high.
2. Soften a small area; scrape the film (the dry-scrape-with-heat-gun exception in (e)(6)(iii)).
3. Keep the gun moving. Do not park it until the wood darkens or the paint chars.
4. Have a fire extinguisher. Heat guns start smoldering dust and drop cloths.
5. Containment and HEPA cleanup still follow (Chapters 10, 11, and 14).
6. Respiratory protection per OSHA 1926.62 — fumes are not just dust.

Worked example — torch the putty. A 1928 sash will stay in the opening. The worker wants a propane torch to soften glazing putty and LBP on the muntins. That is open-flame burning or torching of LBP, prohibited. Use a heat gun below 1100°F, a chemical stripper per the manufacturer, wet methods where electrical allows, or take the sash off-site. Speed is not an exception (Section 13.3).

Official sources: 40 CFR 745.227(e)(3) and (e)(6); 40 CFR 745.223 (abatement includes paint removal); 24 CFR 35.140 (HUD prohibited methods, including poorly ventilated volatile stripping and charring); HUD Guidelines Chapter 12 as a documented methodology under 745.227(a)(3); OSHA 29 CFR 1926.62.