Why cars are painted in a spray booth

If you have ever painted a door or a chair at home, you know what happens: a fly lands on it, dust settles while it dries, a drip runs down. On a car, where the finish is scrutinised and has to last years outdoors, those flaws are not acceptable. That is why automotive paint is applied in a space built for nothing else: the paint booth.

A paint shop within the workshop

The paint area of a body shop is usually split into three separate zones. In the first, parts are prepared: sanded, cleaned and protected with masking wherever paint should not go. In the second, products are prepared: colours, primers and clear coats are mixed to formula, with good lighting and fume extraction. The third is the booth, where the paint is applied.

Keeping these zones apart stops sanding dust reaching a freshly painted panel, and keeps mixing fumes from spreading through the workshop.

What a booth actually does

A paint booth is an enclosed room with an air system that controls everything:

• Cleaned air. Incoming air passes through several stages of treatment so that it carries no dust or particles onto the wet paint.
• Top-to-bottom airflow. Air moves vertically from ceiling to floor, carrying overspray and vapours down to the extraction, away from the panel and the painter.
• Stable temperature. Paint behaves differently depending on heat; a controlled temperature helps it flow out well and dry evenly.
• Good lighting. The painter needs to see exactly how the surface is being covered and spot any defect straight away.

The curing stage

Once the paint is on, the booth changes role: it raises the temperature to speed up drying and curing. That does not just save time; proper curing is what gives paint its hardness and its resistance to chemicals, sunlight and washing. Poorly cured paint can stay soft, mark easily or lose its gloss early.

What you notice on your car

• Fewer dust specks trapped in the clear coat, which would otherwise mean extra sanding and polishing.
• Gloss and texture closer to the factory finish, without excessive orange peel.
• Better-cured paint that stands up to the strong sun and salty air of southern Tenerife.
• A cleaner process for the people working in the shop and for the surroundings.

The painter still makes the difference

The booth creates the conditions, but the result also depends on technique: setting up the spray gun for each panel, keeping a steady distance and angle, moving at a constant pace and overlapping each pass evenly. A gun that pauses for a moment leaves extra paint on that spot and can cause a run. Preparation, environment and experience always go together.

What about quick touch-ups done outdoors?

There are express repairs painted in any old unit or even on the street, with an aerosol or spray gun and no control over the environment. They can look acceptable on day one, but it is easy for the finish to trap dust, for the clear coat to end up duller or for the paint never to cure fully. Over time those differences show: the touched-up area fades sooner, stains or marks more easily than the rest of the car.

Paint and the environment

Painting in an enclosed space with treated air is also a way of looking after the surroundings: vapours and overspray are not released freely outside. On top of that, we work with eco-balance ecological paint, which has a lower environmental impact.

To find out more about how we paint, see our partial respray, full respray and eco-friendly paint pages. And if your car needs some attention, ask for a quote.