Colour Match on a Three-Stage Pearl With a Blend Into an Adjacent Panel
A 2016 hatchback in a metallic tri-coat white pearl is in for a right front guard replacement and a blend into the right front door. The vehicle is eight years old and has covered 140,000 km; the bonnet and roof have faded noticeably compared with the guarded panels. The paint supplier's camera readings on the door and the new guard differ in the mid-coat by a visible amount, and the supplier's variant chips do not resolve the difference. Booth temperature is 22 degrees Celsius and humidity is 55 percent. The refinish technician has a tinting scheme but no spectrophotometer on site; the camera is a shared unit booked out to another site until the following afternoon. The customer has a fixed collection time of 5 pm tomorrow, and the insurer will not authorise blending the bonnet or roof.
1. Explain how you would establish a match and blend strategy given the faded panels and the unavailable camera, and state the risks of each option.
Read the worked answer
The core problem is that the reference panels are not a reliable colour reference because of eight years of UV fade. Matching to the faded door will produce a repair that looks right today but wrong against the bonnet and roof, and it will not match the new guard's factory finish.
Options and risks:
- Tint to the faded door and blend only into the door. Lowest immediate risk of a visible edge at the door, but the guard will read too bright against the bonnet and the A-pillar, and the mismatch will worsen as the repair ages differently from the faded panels.
- Tint to the guard's factory colour and blend across the door. Better long-term match to the bonnet and roof, but the blend panel may need a wider fade zone and the door-to-rear-door edge becomes the risk point.
- Tint to a midpoint between the guard and the faded door. Compromise that spreads the error, often the practical answer when the insurer will not authorise adjacent panel work.
Without the camera, use spray-out cards on the actual panels in daylight and under the booth's colour-corrected lamps, and compare at 45 and 90 degrees. Do not rely on variant chips alone. Build a spray-out of the chosen mix over the actual ground coat and clear, cure it, and compare on the car before committing.
2. The camera becomes available at 2 pm tomorrow and the car must be collected at 5 pm. Set out a realistic plan and state what you would tell the customer.
Read the worked answer
Three hours is not enough for camera reading, tinting, spray-out, cure, blend, clear, and reassembly at 22 degrees Celsius with 55 percent humidity. Be realistic rather than promising a finish that will fail.
Plan:
- Use the morning to prepare and prime the guard, mask the vehicle, and produce hand-tinted spray-out cards against the door and bonnet in daylight.
- At 2 pm take the camera readings on the door, bonnet, and guard, and compare with the morning spray-outs. Adjust the mix if the reading supports it.
- Spray the chosen mix as a test panel on a spare card taped to the door, flash off, clear, and force-cure or allow the specified flash time before judging.
- Only then apply the blend and clear, respecting the clear coat's flash and cure windows. Reassembly and polishing follow.
Tell the customer: the camera delay and the need for a proper spray-out mean a 5 pm collection risks a visible mismatch or a soft clear coat. Offer a revised collection the following morning, explain why the extra time is needed, and confirm the revised time in writing with the insurer so the delay is not treated as workshop slippage.