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Recently updated on July 1, 2022 at 12:37 am
A car usually rusts inside out. The layman does not recognize this immediately. If you see the rust on the side sill, for example, it could mean that it is already rusted through. Good cavity preservation is therefore particularly important for cars that are not moved much. Such cavity preservation is carried out in the cavities of the sub-floor. But there are also cavities on the doors, as well as on the fenders and the trunk lid. There are also cavities on the C-pillars, the sills, in the bonnet as well as on the door edges and window frames. Some of these cavities are only a few millimeters in size.
New vehicles already have one cavity protectionthat effectively protects them from corrosion. Even if the car is not moved frequently. But this protection also diminishes over time. Then rust occurs unnoticed in the cavities and can permanently damage the substance of the car. The renewal of a cavity preservation is therefore necessary after a certain period of time. The cavity preservation is a water-repellent layer made of fat or wax. This layer protects the cavities from moisture, dirt and salt deposits and ultimately from the risk of rust.
Good preparation is important
In order to carry out effective cavity preservation, good preparation is required. This includes a thorough cleaning of the underbody, especially in older cars. Recommended here Dry ice. Alternatively, cleaning can also be carried out with glass bead blasting. Because for an effective preservation you need a good basis. And cleaning the undercarriage with dry ice is such a good basis. Cleaning with a high-pressure cleaner alone is not enough. Finally, as part of the preparation for cavity preservation, a protective layer of transparent wax is applied.
Before cavity preservation, it is also worth checking with an endoscope. In this way, all cavities are identified that are actually present or that may already be covered with rust. For the actual preservation of the cavities, the car should ideally also be lifted onto a lifting platform. Before the anti-corrosion grease is applied, the areas that are not to be treated are masked off. This will prevent contamination. If the cavities to be processed are inaccessible inside the car, various components may have to be removed before the cavity can be preserved. In this way, better accessibility to the cavities is guaranteed.
The right tool is part of it
Since many cavities are difficult to reach, a special tool is required for cavity conservation. In order to be able to carefully apply the anti-corrosion grease conveniently in internal cavities, many experts use a long cavity probe. A so-called cavity gun is also often used. With the help of the flexible spray system, the anti-corrosion grease can also be applied to hard-to-reach areas - again without having to dismantle any components. The spray systems have nozzles of different sizes, which are then suitable for the cavity preservation of wheel arches, sheet metal folds and recesses.
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