If the scratch is not deep and does not penetrate the metal, body repair is not difficult. Treat the scratched area with a repair agent or a very fine polishing paste to remove loose paint from the scratch and repair the damaged area with water.
Apply thin layers of paint to the scratch with a brush. Continue to apply thin layers until the level of paint applied to the scratch is equal to the level of the surrounding paint. The new paint should dry for two weeks. Then treat the painted area with a fine sanding paste. Finally, apply a polish.
If the scratch has penetrated deep enough into the metal and caused rust, the repair technology will be different. Use a penknife to remove rust from the scratch, then apply a rust inhibitor to prevent further rust. Using a rubber applicator, fill the scratch with primer paste. If needed, the paste can be mixed with a thinner to make a thinner paste that is ideal for filling in scratches. Before the paste in the scratch dries, wrap your finger in a cotton cloth, soak it in solvent, and quickly rub over the surface of the scratch. In this case, a depression will appear in the surface of the paste in the scratch. The scratch can now be painted over as described above.