Paint and Body Services for Large Vehicles

Booth length and air volume. A downdraft booth built for passenger cars runs roughly 26 feet of usable length. A Class A coach is 34 to 45 feet. Spraying a vehicle that overhangs the booth means the tail sits in unfiltered air, which is how dirt gets into clear coat on the last panel of a job that went perfectly for the first thirty feet.

Surface area changes the chemistry too. A full refinish on a motorhome is 40 to 250 paint hours, against maybe 20 on a sedan. That is multiple mixed batches over multiple days, and every batch has to land on the same color. On a metallic or a three-stage pearl, flake orientation shifts with gun distance, air pressure and film build, so a batch sprayed at a different pressure reads as a different color under sunlight even when the formula is identical.

The third difference is substrate. Passenger cars are steel and plastic. Large vehicles are gelcoat, fiberglass, aluminum sheet, painted steel, ABS and molded caps, often on the same vehicle, sometimes on the same panel. Each takes a different prep, a different primer and a different flash time. Full refinish work runs $5,000 to $35,000 in this shop, and full rates are on the price sheet.

Blending is the practice of carrying new color into adjacent undamaged panels so the eye never sees an edge. It exists because no repair color is a perfect match to a weathered original, and the human eye detects a hard boundary far more readily than a gradual shift.

The working rules are these. Color goes into the repaired area at full coverage. On the adjacent panel, color is reduced and feathered out over a defined area, then clear is applied across the entire adjacent panel to a natural break line: a body seam, a molding, a trim edge. Clear never stops in the middle of open sheet, because the edge will flash differently and eventually lift.

How far the blend has to travel depends on how far off the match is and how reflective the finish is. A solid white on a fleet van may blend within one panel. A silver metallic on a coach with ten years of Southern California ultraviolet exposure may need two panels either side, because oxidized clear scatters light and the original color no longer reads as the factory formula. That is the judgment call that separates a $500 blend from a $5,000 blend, and the range on color match blending is exactly that, 4 to 25 hours.

Gelcoat adds another layer. Gelcoat is pigmented polyester resin, not paint, and it chalks as it ages rather than fading uniformly. Repairing gelcoat with gelcoat means matching a pigment that has changed, then wet sanding through progressive grits and compounding back to gloss. Repairing gelcoat with urethane paint means the repair will hold gloss longer than the surrounding original, which becomes visible in about two seasons. Which route to take is an estimator decision made with the owner, not a default.

Body repair is metal, composite and hardware. Paint is coating. Most jobs cross the line, and the estimate splits the hours because the labor rates and material calculations differ.

• Body Repair: dent removal, panel replacement, bumper repair and replacement, fender and quarter panel work, compartment doors, entry doors, glass and window resealing. Cab body repair on a truck runs $750 to $12,000 across 5 to 60 hours.
• Paint and Refinishing: full refinish, spot repair and blend matching, custom color matching, custom paint and graphics, paint correction and polishing, ceramic coating.

Material lines follow the split. Paint supplies bill at $55 per paint hour. Body supplies bill at $5 per body hour. Hazmat and disposal adds $45 flat whenever chemicals, refrigerant or LP is involved. Sales tax of 7.75 percent applies to parts and materials only; labor is not taxed.

A full refinish is not a repaint over the existing finish. It is a sequence, and skipping any step is what produces the two year peel most owners have seen on a neighbor's coach.

Hardware, lights, mirrors, moldings and decals come off. Existing finish is assessed for adhesion and sanded or stripped depending on what it is sitting on. Failed clear is removed entirely, because new material bonded to delaminating old clear inherits the failure. Substrate repairs are made and blocked flat. Sealer goes down to give a uniform absorption rate across mixed materials. Base coat is applied in controlled coats with proper flash between. Clear is applied and, on a high-gloss finish, wet sanded and buffed to remove texture.

Time in booth is only part of it. Masking a 40 foot coach for a two-tone or a graphics package takes hours by itself, and the graphics layout has to be plotted before the first coat so the break lines land where the design calls for them. On paint jobs the shop runs 50 to 100 per month, per OCRV Center production records, which is what keeps the crew fast at the masking and layout stages that most shops treat as an afterthought.