Now remove the paint from the damaged area using sandpaper. You can also use a metal brush. At the border of the repaired area with intact paint, sand the paint using fine grit abrasive paper.
If the damaged area is covered with rust, it must be removed with a rust remover and a corrosion inhibitor.
Prepare putty following the manufacturer's instructions. If there are rust holes, they can be covered with zinc or aluminum tape. Make sure the work area is completely clean before moving on.
Apply putty. It is best applied with a flexible spatula. Apply putties at intervals of 20 minutes until the area where the putty is applied protrudes slightly from the rest of the surface.
Profiling can be done using special tools. Then, using progressively smaller grit sandpaper and more water, sand the area to be repaired until it is smooth. Sand down the edges of the border with paint.
Now spray the entire repaired area with a primer from a spray can or apply it with a brush. If a spray can is used, protect other places from getting the agent, the surface should be covered with a primer at a distance of at least 2.5 cm from the border of the repaired area. The primer has a liquid consistency, so the rollers will not form.
With sandpaper (grain size 400) and plenty of water, sand the primed area until it is smooth and blends with the adjoining paint. Small irregularities can be removed with a fine abrasive paste.
Once the paste has dried, sand the area to be repaired again before applying the final coat of primer. Make sure the primed surface is smooth and free from blemishes.
Now apply the top coat. To work outdoors, you need to choose a dry, warm and calm day. Protect other parts of the car from paint ingress. Apply spray paint, starting from the middle of the repaired area, in a thin layer, in circular motions. Apply paint in several thin layers.
After about two weeks, when the paint is completely dry, treat the repaired surface with a special polishing compound. When doing body work, remember that the final quality depends on the effort and time expended.