The final step before painting is to wipe the area with a tack cloth and use unoiled compressed air to remove any particles that may have settled on the car.
Apply a coat of Polyolefin Adhesion Promoter and allow five minutes to dry. The adhesion promoter will help the paint stick to the surface.
On the first application of basecoat, spray only enough product to just overlap the repaired area (#1 in photo). Continue to spray single coats until opacity (dullness) is achieved. Extend each coat slightly beyond the previous one (#2 in photo), allowing the basecoat to flash between coats. You can accelerate the flash time by blowing air at a 45-degree angle on the spot repair with your spray gun. You may tack off between coats only if there are foreign objects in the basecoat that will not blow out. Most paints can be reduced by as much as 50 percent on the last coat. This will help make the color more transparent, facilitating a more uniform blend (#3 in photo). Be sure to check with your paint manufacturer for the proper procedure.
To help illustrate the technique used, we painted the repaired area with white basecoat. Normally the basecoat color would be applied at this stage.
Our paint technician applies the first application of basecoat. Notice that he is spraying only enough product to just overlap the repaired area.
We decided to paint our bumper off of the car to ensure that there were no unpainted edges.