At the automobile plant, PVC plastisol D-11 A with a thickness of 1... 1.5 mm is applied to the lower surface of the body base, spars, cross members and wheel arches for noise insulation and protection against corrosion.
Before restoring the coating, install the car on a lift, carefully inspect the bottom of the body and identify defects in the coating. The bottom of the body is cleaned of dirt, rust is removed with a spatula, sandpaper and blown with compressed air. You can use a rust remover to remove rust «Omega 1» Or an auto rust remover. Install the car in the chamber for applying mastic on the lift and remove the wheels. They close the drums and brake discs with protective covers, insulate mufflers, cables and other places that cannot be treated with mastic with thick paper and adhesive tape.
In case of damage to the protective coating of the bottom without disturbing the soil layer, the damaged areas are degreased with a rag soaked in white spirit and anti-noise mastic BPM-1 with a thickness of 1... 1.5 mm is applied to a dry surface with a brush. The coating is dried under natural conditions during the day or at a temperature of 90°C for 30 minutes. The restoration of the D-11 A plastisol coating is more difficult, since its drying requires a temperature of 130°C for 30 minutes.
In cases of significant damage to the protective coating with damage to the soil layer, the surface is ground to metal, degreased and primer GF-073 or GF-20 is applied. Then, BPM-1 mastic is applied to the primed surface areas with a brush.
If the operating time of the car does not exceed 1... 1.5 years, the overlap of the mastic layer over the old coating layer should be minimahp a longer operation of the car, the mastic should be applied over the entire surface of the underbody and wheel arches.
The paintwork of the body, contaminated with mastic, is cleaned with a rag soaked in white spirit.
In the cold season, before use, the mastic must be kept in a warm room to a temperature not lower than + 20°C. The thickened mastic is diluted with xylene in an amount of not more than 3% by volume.