Corrosion develops quickly in hidden cavities and lower parts of the body when moisture, dirt, salts, and acids come into contact with the surface.
In this regard, during the operation of the vehicle, additional protection is required: for internal surfaces and hidden cavities of the body - by applying special anti-corrosion compounds, and for the joints of parts - by applying sealing mastics.
Anti-corrosion compounds for car body treatment
| № PP | Name of the composition | Brand | Working viscosity, in sec, at 20° according to VZ-4 | Type of diluent, solvent | Drying mode | |
t, °C | time, min | |||||
| 1 | Automotive threshold preservative | "MOVIL" | 15–40 | White spirit, gasoline | 20 | 20–30 |
| 2 | Protective lubricant, non-drying | NGM-ML | 45 | White spirit | 20 | 15 |
| 3 | Protective film coating | NG-216B | 18–22 | White spirit, gasoline | 20 | 20 |
high viscosity | xylene, solvent | 90 | 30 | |||
| 4 | Anti-noise mastic | BPM-1 | (or 24 hours at 18–20°C | |||
| 5 | Plastic polyvinyl chloride | D-4A | high viscosity | – | 130 | 30 |
| 6 | Non-drying mastic | 51-G-7 | high viscosity | – | – | – |
The materials used for anti-corrosion treatment are listed in the table. Auto preservative "MOVIL" is used to treat hidden cavities. It is recommended to treat cavities every 1–1.5 years. It is allowed to treat surfaces previously coated with nigrol and other oils, as well as rusty surfaces.
Protective lubricant NGM-ML is used for processing hidden cavities. This material is used to process cavities of all new cars.
Protective film coating NG-216 B is used to cover parts of the car under the body.
Bitumen anti-noise mastic BPM-1 is used to protect the underbody from corrosion and to reduce vibration noise. The mastic is applied by spraying or manually with a thickness of 1.0–1.5 mm.
Plastisol D-4A is used for sealing welded seams on the outer areas of the body.
Non-drying mastic 51-G-7 is used for sealing body joints.
The anti-corrosion substance is sprayed into the internal cavities using air or airless spraying.
Air spraying requires compressed air with a pressure of 0.5-0.8 MPa, a spray gun with a tank, hoses and extended nozzles for the gun. The best coating quality is achieved with airless spraying under a pressure of 4-12 MPa, which allows spraying materials of significant viscosity.