I-CAR ProLevel Refinish cheat sheet

Isocyanate exposure limits: OSHA PEA is 0.005 ppm as an 8-hour TWA and 0.02 ppm as a 10-minute ceiling; NIOSH REL is 0.005 ppm TWA and 0.02 ppm ceiling. Air-purifying respirators are not permitted for isocyanate exposure; use supplied air.

Supplied-air respirator selection: a Type C airline respirator with a full facepiece in pressure-demand mode, or a hood/helmet, is the standard for spray booths and mixing rooms where 2K isocyanates are open.

VOC compliance is product- and jurisdiction-specific: the coating's VOC is measured as applied, including reducer and hardener, so adding a compliant reducer to a high-VOC base can still exceed the category limit.

LFL/LEL of common solvents: most refinish solvents have a lower explosive limit near 1-2% by volume in air; a combustible gas meter reading above 10% LEL means stop work and ventilate.

Grounded, bonded equipment: solvent drums and spray guns must be bonded to the same ground as the object being cleaned or sprayed; static discharge is a documented ignition source during gun cleaning.

Spontaneous combustion risk: rags and booth filters soaked with linseed oil, some enamels, and overspray residue can self-heat; store in a listed self-closing metal container and remove from the building daily.

Hearing and skin: booth and gun noise often exceeds 85 dBA; nitrile gloves resist solvents better than latex, and glove change is required when solvent breakthrough (wrinkling, swelling) occurs.

Waste streams: leftover 2K paint, hardener, and gun-cleaning solvent are hazardous waste; do not pour into drains or evaporate in the booth, and keep manifests for the required retention period.

Identify substrate before sanding: a magnet test separates steel from aluminum; a plastic part may carry an ISO identification code molded into the back (e.g., PP/EPDM, PC/PBT, PA-GF), which determines adhesion promoter and flexibility needs.

Bare steel requires abrasive blasting or mechanical sanding to a defined surface profile plus an epoxy or direct-to-metal primer within the product's recoat window; flash rust means recleaning.

Aluminum: sand, then apply a conversion coating or an aluminum-compatible epoxy primer; bare aluminum oxide forms within minutes and blocks adhesion if left untreated.

Galvanized and zinc-coated steel: do not sand through the zinc; clean, abrade lightly, and use a primer specified for zinc, since some epoxy and acid-etch products react with zinc.

Bare plastic: clean with a dedicated plastic cleaner, then apply the manufacturer's adhesion promoter for that plastic family; flexible parts (TPO, PP) require elastomeric additives in the topcoat to avoid cracking.

Previously refinished panels: test unknown coatings with solvent on a hidden area; a coating that lifts or wrinkles with lacquer thinner must be stripped or sealed, not simply sanded and topcoated.

E-coat and OEM primer: sand with the grade the product data sheet specifies, then clean and use a sealer or primer compatible with the OEM system; breaking through e-coat to bare metal requires primer.

Cleanliness sequence: wash, then use a wax-and-grease remover with two clean cloths (wet and dry wipe), then tack off; silicone contamination causes fish eyes even at trace levels.

Three-angle spectrophotometer readings (e.g., 15, 45, 75 degrees) are used for effect colors; solid colors can be measured at a single angle. Always take more than one reading and average.

Variant selection: the color retrieval system offers OEM variants by plant and model year; choose the variant that matches the vehicle, then tint from there rather than starting from a generic formula.

Tint strength ranking in practice: black and white toners are the strongest and shift value most; use the smallest possible addition and re-check on a sprayout, not on a stirring stick.

Metallic/pearl control: flake orientation is set by application (gun distance, speed, flash time) and by reducer choice; a color that matches wet may not match dry, so always compare a cured sprayout.

Mix ratio arithmetic: for a 4:1:1 ratio by volume, total parts = 6; for 100 mL of mixed material, base = 100 x 4/6, hardener = 100 x 1/6, reducer = 100 x 1/6.

Pot life starts at the moment hardener is added, not when spraying begins; a 2K product past its pot life will not cure properly even if it still sprays.

Color check conditions: use a controlled light booth or natural daylight at 45 degrees, and check metamerism by comparing under two different light sources.

Record the final formula, including all tint additions and the sprayout panel, so a repair or a second panel can be reproduced exactly.

Fluid tip sizing: smaller tips (e.g., 1.2-1.3 mm) suit basecoat and clear at low viscosity; larger tips (1.4-1.8 mm) suit primers and high-build products. Tip size and fan pattern must match product viscosity.

Gun balance: set inlet pressure with the trigger pulled and air flowing (dynamic pressure), not static; the data sheet's recommended inlet pressure assumes a flowing gun.

Fan pattern test: a proper pattern is uniform edge to edge with no split tail; a split pattern indicates a clogged or damaged fluid tip or too much air.

HVLP versus compliant: HVLP transfer efficiency is typically 65% or better at the cap; compliant guns run higher cap pressure and lower transfer efficiency, so material consumption differs.

Clean sequence: flush with solvent, disassemble, clean the fluid tip and needle with a soft tool (never a hard pick that scratches the seat), lubricate moving parts with the specified lubricant, and torque to spec.

Air quality: a coalescing filter plus a desiccant dryer at the booth drop prevents moisture and oil from causing fisheyes and poor adhesion; drain traps daily.

Booth checks: verify booth balance (intake versus exhaust), filter loading, and temperature before spraying; a booth out of balance pulls overspray onto the wet film.

Gun storage: leave a small amount of compatible solvent in the gun for short storage, and never store a gun with 2K material mixed inside.

Defect-to-cause quick rules: solvent pop = film too thick or flash too short; orange peel = viscosity too high, pressure too low, or gun too far; runs = too slow a pass or too heavy a coat.

Fisheyes come from surface contamination (oil, silicone, water) or from airborne contamination in the booth; the fix is cleaning and filtration, not more flow additive.

Dry spray results from too much distance, too fast a pass, or excessive air; it looks like a rough, non-glossy texture and must be sanded out before clear.

Recoat window: applying the next coat after the window has closed without sanding causes intercoat adhesion failure; the data sheet gives the open and closed times.

Clearcoat application: two medium coats with proper flash is more reliable than one heavy coat; heavy single coats trap solvent and cause popping and dieback.

Blending: use a blending solvent or a reduced edge, and keep metallic blend edges away from panel centers; a hard tape line is the most common blend failure.

Film build measurement: a mil gauge on the cured film confirms whether the specified dry film thickness was achieved; excessive build increases chipping and cracking risk.

Cure before delivery: forced cure and bake schedules are product-specific; delivering before full cure causes dieback, water spotting, and imprinting.

System compatibility rule: primer, sealer, basecoat, and clearcoat must come from a documented compatible system; mixing brands without the manufacturer's written approval voids warranty and risks adhesion failure.

Product data sheet fields to check every time: mix ratio, pot life, induction time, wet and dry film thickness, flash time, recoat window, and VOC.

Primer versus sealer: primer builds and fills; sealer provides uniform color holdout and adhesion over a repaired or unknown substrate. Use sealer under translucent or metallic colors.

Hardener selection: standard, fast, and slow hardeners change pot life and cure speed with temperature; using a fast hardener in high heat shortens pot life and can cause solvent pop.

Documentation: record the VIN, color code, variant, product codes, batch/lot numbers, mix ratios, film thickness readings, and spray environment on the repair order.

Warranty evidence depends on documented use of the approved system and the specified film builds; missing records are the usual reason a claim is denied.

Reducer selection: temperature-specific reducers (fast, medium, slow) control flow and solvent evaporation; the wrong reducer for ambient temperature causes either dry spray or runs.

Shelf life and storage: hardeners degrade with moisture and heat; store sealed, and do not use product past its date code or after freeze exposure unless the data sheet allows it.