Evaluate the dents.
Dents can typically be removed using this method if they are located on the metal panels of the trunk, hood, doors, roof, or fenders, and are not right along the edges on broad flat surfaces. To achieve the best results, use this method on shallow dents that do not contain major creases or paint damage, and that cover a surface area with a diameter of at least 3 inches (7.62 cm).
Obtain the materials needed to remove the dent.
You will need a hair dryer, heavy-duty or thick rubber gloves for safe handling of the dry ice or compressed air in its liquid format, aluminum foil, and either a package of dry ice or a can of compressed air. You will need some of the following: Heavy-duty insulated rubber-coated gloves. A full (or nearly full) can of compressed air. A package of dry ice. A hair dryer with adjustable temperature settings, such as "Low," "Medium," and "High," or "Cool," "Warm," and "Hot." Aluminum foil.
Apply heat to the dented panel.
Turn on the hair dryer and use it to blow hot air over the dent and the surrounding area for one to two consecutive minutes. The hair dryer should be set to medium and should be held between 5 and 7 inches (12.7 and 17.78 cm) away from the car's surface. Do not overheat the area in order to prevent the paint from becoming damaged due to overheating.
Insulate the dented area of the panel (if applicable).
Place a sheet of aluminum foil over the top of the dented area. This step should only be performed if you are using dry ice instead of compressed air. The purpose of this step is to keep the area warm while also protecting the paint from the dry ice, which can potentially damage the topcoat.
Put on the heavy-duty gloves.
The gloves will protect you from frostbite and other injuries that can occur when your skin comes into contact with dry ice or liquified compressed air.
Apply the dry ice or liquified compressed air.
The rapid change in temperature from warm to cold will cause the surface of your vehicle to first expand (when heated) and then contract (when cooled). If you are using dry ice, grab a block of the ice with one hand, then gently rub it over the aluminum foil resting on top of the dented area. If you are using a can of compressed air, turn the can upside down, and spray the surface of the dented area to cover the area with a layer of liquid ice. There are some basic principles of science at work here: the pressure, volume, and temperature of a gas are all interconnected. While normally the can loses temperature as the gas is released, if you spray the can upside down the gas itself is cooled. Either method will only require a brief application. The surface panels of most modern vehicles are made of relatively thin and lightweight material and they will cool very quickly. You will likely not see any change after the first 30-50 seconds of application (or probably even sooner than that).
Wait for a little while.
A few moments after you have applied the dry ice or compressed air, you may hear a popping sound that will indicate the dent has been removed. The rapid temperature shift will usually make the material reform its original shape. If you used dry ice, remove and dispose of the aluminum foil after the dent has been removed. If you applied liquid ice by means of compressed air, wait for the white foam to dissipate from the surface of the car, then wipe residue away with a gentle cloth.
Repeat the process as needed.
For certain dents a single application may not be enough. If you see improvement but a dent is still noticeable, you can begin the process of heating and cooling again. However, do no overuse this process (especially in a single day). While the rapid temperature changes can reshape your car exterior, the extreme cold is potentially hazardous to the paint.
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