Applied Refinishing, Estimating, and Customer-Vehicle Documentation

Applied Refinishing, Estimating, and Customer-Vehicle Documentation

This externship lesson brings together the skills you have practiced in school and applies them to real customer vehicles under a shop supervisor's guidance. You are responsible for professional-quality results, accurate paperwork, and a delivery experience that protects the shop's reputation and your own.

Surface Preparation

Proper surface preparation determines whether the finished repair lasts or fails. Begin by identifying the repair boundary—the area to be primed and the larger area to be blended. Sand damaged metal or filler to the required featheredge using the appropriate grit sequence on your dual-action (DA) or long-board sander; coarser grits cut and shape, finer grits refine the surface for primer. Clean the area with a wax-and-grease remover and a clean, folded wiper—always wipe in one direction, never back and forth, to avoid redepositing contamination.

Mask all adjacent panels, glass, trim, and openings that must stay free of overspray. Use masking paper and tape dispensers efficiently; back-tape edges where a crisp blend line is needed. Mix primer according to the manufacturer's data sheet—follow the stated mixing ratio precisely, because incorrect catalyst ratios cause adhesion failure or extended dry times. Apply primer in thin, even coats, allowing flash time between coats. Block-sand cured primer with the grit specified by the paint manufacturer before applying color.

Paint Mixing and Application

Your shop's spectrophotometer reads the existing paint on the vehicle and compares it to a database of formulas. Select the formula variant that the device recommends—color shifts with age, UV exposure, and prior repairs. Weigh each toner on the mixing scale in the sequence and gram amounts the formula lists; adding toners out of order or estimating amounts causes color mismatch that is difficult to correct.

Before spraying, confirm the spray booth is set to the correct temperature and airflow for the paint system in use (waterborne and solvent-borne products have different requirements). Set your HVLP or compliant spray gun to the manufacturer's recommended fluid tip size, air pressure at the cap, and fan width. Apply basecoat in the number of coats specified, allowing proper flash time between each. When blending, feather the basecoat into the adjacent panel gradually; the blend edge must not create a visible boundary once clearcoat is applied. Apply clearcoat over the entire repair panel and blend zone, maintaining a wet edge and consistent gun speed. Follow the paint line's bake or air-dry schedule before polishing.

Compound and polish the clearcoat using a DA polisher and the pad/compound combination your supervisor specifies. Work in overlapping passes; avoid burning through at edges. The goal is a surface free of orange peel, sanding marks, or runs that matches the gloss of the surrounding panels.

Respirator Safety in the Spray Booth

Isocyanate-containing clearcoats and many primers present a serious inhalation hazard. A supplied-air respirator (SAR) provides the highest level of protection in the booth and is required by many shops when spraying isocyanates. If your shop uses an air-purifying respirator (APR) instead, it must carry the correct NIOSH approval for organic vapor and paint spray (OV/P100 combination), must fit-test correctly on your face, and its assigned protection factor must be appropriate for the exposure level. Never enter the booth while spraying without the correct respirator in place. Inspect cartridges before each use; replace them on the schedule your shop sets, not just when you notice odor—by the time you smell solvents through a cartridge, it may already be saturated.

Estimate Entry and Supplement Identification

Under your supervisor's direction, open the shop's estimating system—CCC ONE, Mitchell, or Audatex—and locate the vehicle by VIN or existing repair order. Damage line items include labor times for remove and replace (R&R) or remove, repair, and replace (R&R/R), refinish times, and any parts or materials charges. Labor times in these systems are database-driven; the estimator selects the correct operation and the system populates the time. Your job is to select the right operations, confirm part numbers, and verify that included and overlapping operations are handled correctly.

Compare your completed estimate to the insurance appraiser's initial appraisal. A supplement is any additional damage or operation that was not on the original appraisal. Common supplement triggers include hidden damage found after disassembly, required OEM repair procedures not recognized by the appraiser, and materials not itemized initially. Document each discrepancy in your field log: describe the line item, the dollar difference, and whether it was approved, negotiated, or still pending at time of writing.

Quality-Control Inspection and Vehicle Delivery

Before any vehicle leaves the shop, walk it with your supervisor using a structured checklist. Check panel gaps for consistency against adjacent panels; uneven gaps can indicate misalignment or incorrect installation. Inspect the paint match under multiple lighting conditions—natural daylight, the booth light, and if possible a color-temperature lamp. Verify trim alignment, molding clips, and any glass that was removed is properly sealed. Check for masking tape or paper left inside door jambs or under hoods.

Record any items on the checklist that do not meet the standard, describe the corrective action taken, and note who performed it. If a vehicle is returned by the customer with a complaint (a comeback), document the specific concern, the technician's finding, and the remedy. This record supports warranty claims and helps the shop track recurring quality issues.

Your field log is a legal-quality document: write in ink, date every entry, and never erase—draw a single line through corrections and initial them.