Paint protection film and window tint are unforgiving in a way that polishing is not. A single trapped particle is permanent, visible, and yours to redo. Lighting a fitting bay is as much about spotting contamination before it is sealed under film as it is about seeing what you are doing.
What makes film work different
Three things separate a PPF or tint bay from a general detailing bay.
Dust is the enemy, not defects. In correction you are removing material. In film work you are sealing a surface, and whatever is on it stays there. Your lighting needs to reveal particles on a clean panel, which is a different job from revealing scratches in paint.
You work through a transparent layer. Judging whether a bubble, a stretch mark or a contamination point is under the film or on top of it needs light coming from more than one direction.
Glass is a mirror and a window at once. Tint work involves looking at glass from both sides, with light passing through it. Direct glare in your eyeline makes it almost impossible to read the surface.
Seeing contamination before you seal it
The technique is the same as spotting high spots on a coating. You need a light source you can view the panel against at a shallow angle, so particles cast a visible micro shadow and catch the light.
Overhead light alone will not do it. A particle sitting on a horizontal bonnet under a ceiling light is lit from directly above and casts almost no shadow, which makes it nearly invisible right up until it is under film.
A run of wall mounted light bars or a light tunnel at panel height gives you the low angle you need. Sweep your eye along the panel with the light behind the surface rather than above it, and contamination appears as bright specks.
Controlling dust in the first place
Lighting shows you the problem. These reduce it.
- Separate the bay from wet and abrasive work. Sanding, cutting and compounding all put particles in the air that settle for hours.
- Damp the floor before starting. A wet floor holds dust down. This is why so many fitters work over a damp floor.
- Seal the floor. Bare concrete sheds dust continuously. Tiled or resin flooring does not, which is one of the underrated reasons to sort the floor in a film bay.
- Keep doors shut and limit movement. Every time the shutter opens you import the car park.
- Wear appropriate clothing. Fleeces and knitwear are particle dispensers.
- Consider positive pressure or filtration if film work is your main service.
Glare control for tint work
This is where most tint bays get lighting wrong. Bright fittings directly in your line of sight while you are squeegeeing a rear screen make it impossible to read the surface, and cause genuine eye fatigue over a day.
Three fixes.
Use diffused sources, not bare LEDs. A large, evenly lit surface produces a soft reflection you can see through. A bare chip produces a hot spot that blinds you. This is the main practical argument for flat diffused panels in a film bay.
Put light where you need it, not where you are looking. Position fittings so they illuminate the glass from behind or above your working position rather than facing you through it.
Make it dimmable and zoned. Being able to drop the level on one side while keeping the other bright is genuinely useful when working across a vehicle.
A sensible bay specification
- Ceiling: a diffused grid providing even shadow free coverage across the whole vehicle, dimmable, ideally suspended low enough to be effective if the ceiling is high
- Walls: light bars at panel height for low angle contamination checks, on a separate switch
- Handheld: a high CRI inspection light for close checks along edges and wrapped lips
- Colour temperature: 5000K to 6500K, high CRI, so you can accurately judge film clarity and any colour shift in tint
- Surfaces: light walls and a sealed light floor to bounce light and shed less dust
Checking the finished job
Walk the car three times. Once under the ceiling lights for overall coverage and alignment. Once with the ceiling off and the low angle lighting on, looking for trapped contamination and lifting edges. Once with a handheld light along every edge, wrap and shut line.
Anything you find in the bay is a fix. Anything the customer finds on the driveway is a redo.
Frequently asked questions
Can I use the same bay for correction and PPF?
You can, but not on the same day if you can avoid it. Compounding dust settling onto a panel you are about to film is the most common cause of contamination.
What lighting shows contamination best?
A broad source viewed at a shallow angle across the panel, which means wall or tunnel lighting rather than ceiling lighting alone.
Does lighting affect tint colour matching?
Yes. Judging how a film reads on glass needs high CRI light at a consistent colour temperature, otherwise different bays will give you different answers about the same product.
Spec a film bay properly with our hexagon lighting, wall lighting and tunnel lighting ranges, or talk to us about your unit.