Heat guns

A heat gun makes film workable, and you measure at the film

What is a heat gun? A power tool that heats air to several hundred degrees over a heating element and blows it out in a focused stream. On a car, it shapes film, softens the adhesive on old stickers and shrinks heat-shrink tubing. Not suitable for glass, for curing coatings or for reviving faded plastic.

Heat guns are handheld hot air blowers: a fan draws air in, a heating element heats it, and a push-on nozzle shapes the hot stream. Depending on the tool, you set temperature and airflow in a few stages or in fine steps. You'll also hear them called hot air guns or hot air blowers. Around the car, they're the tool for vinyl wrap and paint protection film, for softening the adhesive under stickers and for heat-shrink tubing on wiring.

• Fine steps with a display make film work repeatable. In its heat gun test, AUTO BILD rated control in 10-degree steps with a temperature display as a strength of one test winner. For you, that means: what worked on the first door, you dial in again on the second, instead of guessing between warm and too hot.
• Film wants 40 to 50 °C, not 650. That's the film temperature 3M gives for shaping its 2080 Series wrap film. Depending on the model, the nozzle of a mains tool puts out many times that. In practice: how warm the film gets, you control through setting, distance and time.
• Paint protection film wants around 82 °C at the edge. That's the figure 3M gives for the edges of its paint protection film after application, almost double what a wrap film needs for shaping. Day to day, that means paint protection film follows its own manufacturer values, not those of wrap film.

Detailing1's tip from the shop: Which setting at which distance gives you the right film temperature depends on tool, nozzle and airflow, and it's in no table. So try it on an offcut first and note the combination of setting, nozzle and distance that hits the film manufacturer's figure. On every panel after that, you start right there instead of searching all over again.

A heat gun heats the air, not the panel

A heat gun heats air over a heating element and blows it out in a focused stream; the panel only gets as warm as the stream, the distance and the time allow.

That's exactly what makes the tool controllable. The temperature on the display describes the air at the nozzle outlet. Just a few centimetres further on, the stream is cooler, and a surface the nozzle moves across briskly only takes up part of that heat. If the nozzle stays put, on the other hand, the heat builds up in one spot. That's where paint burns, plastic warps or glass cracks.

FLEX explicitly lists car wrapping, removing stickers, paint and adhesive residue, shrinking and loosening seized connections for its heat guns. For car care, three of those jobs matter most: shaping and post-heating film, softening the adhesive on stickers and closing heat-shrink tubing on wiring connections.

A look at the material shows why heat makes such a difference with film. Warm film turns soft and stretchy and lays into curves; cold film creases or tears. Warm adhesive loses its strength, and the sticker then peels off slowly and flat. In both cases the heat is a means to an end, not the goal.

What sets the tool apart from a hairdryer is temperature and control. Mains and cordless tools alike reach several hundred degrees and hold set values or fixed stages. A hairdryer blows warm air but can't be set to any temperature a film manufacturer specifies.

Mains tool with a degree scale, cordless tool with two stages

Heat guns come as corded mains tools with fine temperature control or as cordless tools with a few fixed stages that work anywhere on the car without a socket.

One example of a mains tool is the FLEX "HG 650 2000" heat gun. It delivers 2,000 watts, regulates from 50 to 650 °C in 10-degree steps and has two airflow settings of 250 and 500 litres per minute. Temperature and airflow show on the LCD display; the tool weighs 0.7 kg, the cable is 4 m long and four nozzles are included.

On the cordless side there's the FLEX "HG 530 18" cordless heat gun (18V) with two stages, 260 and 530 °C, at 130 and 200 litres per minute. According to FLEX, it reaches about 300 °C after around 15 seconds, weighs 0.6 kg without battery and comes with three nozzles. It runs on all FLEX 18 V batteries from the battery systems; battery and charger aren't included.

FLEX doesn't give a runtime per charge for the HG 530 18. For context: in the F.A.Z. test, a different cordless hot air blower with a 4 Ah battery ran just under ten minutes on stage 2, with the temperature dropping towards the end. Hot air is a constant drain. For whole areas of film that points to the mains tool, for short jobs without a socket to the cordless one.

The cordless tools are grouped on the Cordless heat guns page. Sanders, compressors and the other machines for paint, film and compressed air are under Tools.

Adjustable temperature counts for more than wattage

Wattage tells you how fast a heat gun heats the air; whether film and paint survive the job depends on the temperature control holding a set value.

For work on a car, wattage is the second question. According to the F.A.Z. buying guide, mains tools typically sit between 1,500 and 2,300 watts and reach film temperatures with ease. What's critical is how finely and how visibly you can set the temperature, because a film manufacturer doesn't specify an output, it specifies a temperature.

The nozzle shapes the stream. The flat nozzle spreads it into a wide band that warms an area of film evenly. The reflector nozzle wraps the hot air around a workpiece; for you, that means heat-shrink tubing shrinks from all sides at once without you having to turn the cable. The reducing nozzle focuses the heat on one point, such as a single film edge.

Airflow is the second control. It decides how much heat per second reaches the material and how wide the stream acts. Then there's distance, which you adjust without touching a button: instead of turning the setting up, you move closer; instead of turning it down, you move away. An infrared thermometer lets you check that straight away. On a cordless tool with only two stages, distance is actually the only stepless control.

For buying, that means: a tool with a few fixed stages is fine for adhesive and heat-shrink tubing, where a range is enough. For film, where a manufacturer specifies a narrow temperature window, fine control with a display is the criterion that counts.

The film sets the temperature, not the gun

The film manufacturer sets the temperature film needs for shaping and post-heating; you measure it at the film with an infrared thermometer, not at the nozzle.

For its 2080 Series wrap film, 3M gives 40 to 50 °C for shaping and 80 to 95 °C for post-heating. Avery Dennison specifies 40 to 55 °C for shaping and 90 to 95 °C for fixing for its SWF, with different values for the manufacturer's other films. So there's no general film temperature, and paint protection film follows its own manufacturer values too.

Post-heating means the fully applied film is brought up to the higher manufacturer value once more in recesses, channels and at edges. Put simply, it takes out the tension in the stretched film that wants to pull it back to its flat original shape. Day to day, you notice it because the film doesn't lift out of the recess later and the edge stays down.

The routine is the same with every film. First read the film manufacturer's spec; on gloss 3M film, peel off the protective liner beforehand. Then start with the flat nozzle, a low setting and some distance, keep the nozzle moving and bring the film to the manufacturer's value as you shape it. After application, post-heat edges and recesses, leaving glass areas out.

Heat helps when removing old film too. It softens the adhesive so the film peels off flat and slowly instead of breaking off in small pieces. In its removal guide, 3M gives a film temperature of 72 to 93 °C for this and explicitly rules out glass. Whatever adhesive is left after that is a job for chemistry, not an even hotter nozzle.

You don't feel temperature, you measure it. On the first panel, measuring takes longer than heating; that's part of it and gets quicker with every surface. What else wrapping needs is in Wrap accessories; this page is only about the heat.

According to Google Trends, searches for heat guns peak in December. Regardless of the season, 3M gives an ambient temperature between 16 and 30 °C for applying paint protection film.

Not every film needs heat; large lettering you erase

Which route fits depends on the job: shaping film or taking it off in one piece works with heat, while large, weathered lettering comes off with the vinyl eraser wheel on a drill.

Heat is the way to go as long as a film needs to become workable or come off in one piece: when shaping and post-heating a wrap, when removing a sticker whose adhesive still gives, and when closing heat-shrink tubing.

For large, weathered lettering, pinstripes and whole areas of adhesive, mechanical work is the alternative to heat. For that there's the Koch-Chemie Folienradierer für Bohrmaschinen with the matching Koch-Chemie Folienradierer-Adapter für Bohrmaschinen. The wheel takes off film and adhesive by friction; limits and routine are explained on the Vinyl eraser wheels page.

If an adhesive film remains after heat or eraser wheel, chemistry takes over. An Adhesive remover dissolves the film, and a plastic blade like the Koch-Chemie Scraper with 10 blades lifts stubborn edges. The full routine with heat, blade and chemistry is described in the guide Removing adhesive residue.

For a single dealer sticker, a hairdryer, plastic scraper and adhesive remover are enough. Your own heat gun pays off as soon as you work with film, heat-shrink tubing is part of the job or you need heat regularly.

Glass, coating and clear coat set the limit for heat

Hot air doesn't belong on glass, not on fresh coatings and not on one spot of paint for long; unevenly heated glass can crack, overheated paint can burn.

When removing film, 3M explicitly warns against heating glass, because it cracks when heated unevenly. The FLEX manual adds: don't hold it on one spot for long, watch out for hidden flammable materials, ventilate if fumes develop and don't get too close to the surface. On a car, that includes seals and plastic parts right next to the work area.

In our research, no manufacturer names hot air for curing ceramic coatings, neither Koch-Chemie nor Gtechniq. So we don't recommend it. Curing follows the times and conditions the coating manufacturer specifies, not the output of a gun.

Plenty of videos show faded plastic being turned black again with hot air. According to Gtechniq, AUTO BILD and a Nissan service instruction, the effect only lasts weeks, and the heat can damage the material. A Plastic care product with UV protection that you renew regularly protects the surface instead of just giving it a bit of colour for a short while.

So the decision is short. If you work with wrap film or paint protection film, get a mains tool with a degree scale and an infrared thermometer. If you need heat briefly and without a socket, the cordless tool will do. If large lettering has to come off, the vinyl eraser wheel spares the paint the heat.

The nozzle can do 650 degrees, the film wants 50. Measure at the film instead of at the nozzle and you work with the material, not against it. That's exactly the difference between film that stays put and film that lifts at the edge again.