The entire surface of the bottom, including the cavities under the rear wings, is covered with a layer of PVC protection. Particularly exposed areas under the front fenders are protected from stone impacts by lockers, all cavities are covered with a special paste. In addition, individual body parts are made of galvanized iron. Before winter and after washing the bottom, the condition of the protective layer should be checked and preserved with a bottom preservation paste.
Dirt, clay and sand can accumulate in places prone to throwing sand and stones. It is especially important to remove this dirt, which contains a lot of salt, especially in winter. If this dirt is not completely removed, there is a danger that it will not dry out. This can lead to through rust showing through, which over time will not be able to be stopped by any anti-corrosion agents.
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