Removal scratches on the car body
If the scratch is shallow and does not reach the body metal, the repair is very simple. Lightly rub the scratch area with Turtle Wax New Color Back, or a paste such as Holts Body+ Plus Rubbing Compound.
Using a brush, apply automotive paint to the scratch until the surface of the paint in the scratch is even with the surrounding paint. Allow the new paint to cure for at least two weeks, then buff the area with a paste such as Holts Body+ Plus Rubbing Compound or Turtle Wax New Color Back.
If the scratch reaches the metal of the body, a different technique is required. Remove the rust with a pocket knife, then treat with a rust neutralizer, such as Turtle Wax Rust Master, to prevent future rust. Using a rubber or nylon applicator, fill the scratch with Holts Body-i-Plus Knifing Putty. The scratch can now be painted as described earlier.
[This publication is borrowed from the resource: audimanual]