Why is Paintless Dent Repair the superior method of car body repair?
5th November 2017
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Nobody likes to have their car repaired in the bodyshop, no-one likes to have their car painted (unless of course, they’re having a full custom re-spray), but why is that? To answer this question we really need to go back to the factory where the car would’ve received its original coating.

 For starters, production cars are generally painted by robots under laboratory-like conditions, there is no dust from rubbed down paint and filler, no insects, damp or any other contaminants to cause possible flaws in the final finish. At this point, it is still a bare metal shell with no trims, handles, glasswork or anything else to cause obstruction or a break in the paint.

Firstly the car is coated in primer to seal the metalwork and to give the top-coat the perfect base to adhere to. Some are still sprayed but many now dip and roll the car in the paint to ensure complete and even covering. This is then baked at around 200’C which is only possible due to the lack of ancillaries on the car.

Now it is time to add some colour. This is the bit done by the robots that you see in the video clips. They will be programmed to cover the entire car with a perfectly even coat of paint to within a few microns. To help with this the metal is also polarised, a negative charge is placed on the car and a positive one on the paint as it leaves the gun. This causes the paint to be physically drawn to the metal. The robots will always be pointing their paint guns in the same direction making sure that any metallics or inclusions in the paint lay on the panel in the same direction so you don’t end up with a patchwork effect on different panels. The car is once again baked at around 200’ before a clear layer of lacquer, (sometimes even tinted)  is laid over the top to give that protective high gloss finish once again baked hard on to the vehicle.

To further complicate things from a bodyshop’s perspective, factories tend to buy their paint in bulk batches and with thousands of possible formulations usually made from many different colours, what you would think is the same car in the same colour can have several different variations for the bodyshop to try and mix up and match.

So, the question was; ‘why is paintless dent repair the superior method of car body repair?’ The simple answer is; because it keeps that original, precisely applied, perfectly even and flawless factory paint intact. The metal is expertly massaged, pulled, pushed and knocked back to the shape it is supposed to be without disturbing any of the coats applied to the car at the factory. The perfect seal created by the robots is not broken and if the repair is carried out to a high standard the dent can be made to totally disappear.

The alternative to a paintless repair usually involves a bodyshop and goes a little something like this; Firstly that precisely applied factory paintwork is ground off the car to expose the bare metal. The metal is then re-shaped by panel beating or welding tabs to it and pulling the dent out and to iron out any flaws left behind by this process, a layer of filler will be applied to smooth things over. On top of this comes a primer then over larger areas, the colour and the lacquer very often being ‘blended’ into neighbouring panels to fade out the difference in the finish from the factory paint so it is not so easily noticed. The level of quality of all these processes is very often governed by how much is being paid for the repair, as with most things in life, you get what you pay for. A good bodyshop will bake the vehicle thoroughly (up to a maximum of about 70’C) between layers and allow plenty of time for the materials to harden so avoiding a risk of sinkage as they settle down. Paint colours need to be matched as precisely as possible and even the air pressure on the paint gun needs to be correct to create the right ‘orange peel’ effect in the final coats. A highly skilled bodyshop that takes great care in their work can get a very similar looking finish to that applied at the factory but it is clear that it is never going to be the same because it is just not possible to recreate the same conditions and follow the same processes carried out by robots designed to do the job. On top of that, highly skilled bodyshops that take great care in their work are pretty hard to find and when you do, they tend to be very expensive (and rightly so).

Now I don’t claim in any way to be an expert when it comes to applying paint coatings in car factories or all the processes carried out in bodyshops, all the information above has gathered from a combination of online research and discussions with/observation of industry professionals over many years. However, in the course of my profession, I do spend all day every day staring at car paint in microscopic detail and can usually spot a panel the has been refinished straight away. I guess that makes me reasonably expert in how a bodyshop repair replicates the original factory paint and in my humble opinion it rarely stands up to scrutiny. You don’t have to take my word for it, I believe if you ask anyone that works in a bodyshop whether they would rather re-paint their car or have a paintless dent repair by a first-class technician that could make the damage disappear and retain the factory coatings, they would go for PDR every time. That is why I believe Paintless Dent Repair is the superior method of car body repair.

Jon Taylor. IMI accredited PDR Master Technician

Want to get rid of your cars dent?

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About the Author

Jon T

Member since: 31st January 2017

I am certified by the IMI (Institute of the Motor Industry) as a Master Technician so you can be assured of the highest quality service.

I am trusted and regularly carry out repairs for bodyshops, insurance...

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