Why are there streaks on the painted surface after spray painting?
2 Answers
There are generally several reasons for wrinkling after car spray painting: 1. Water was used during the application of body filler (putty), and painting was done without waiting for the water to dry completely, causing wrinkling. 2. The surface to be painted was not cleaned with a degreasing cloth or similar before painting, resulting in poor paint adhesion and wrinkling. 3. Poor quality paint, excessive use of drying agents, or too rapid solvent evaporation. 4. Uneven or overly thick paint mixture. 5. The paint film was applied too thickly or unevenly. 6. Painting was done in high temperatures or under direct sunlight. 7. The surface requiring painting was not fully or thoroughly sanded by the contractor, leading to wrinkling.
After painting, the appearance of streaks on the painted surface is commonly referred to as orange peel or sagging. This usually indicates a problem during the painting process. For example, if the spray gun is too far from the car surface, the paint may dry in the air, forming small particle streaks. High humidity can also cause the paint to flow too slowly and not spread evenly. Another possible cause is improper paint thinning ratio—it shouldn't be too thick or too thin. I remember encountering this issue once, and the technician mentioned that excessive air pressure could also create streaks. It's advisable to first assess the severity of the streaks. If they are minor, they can often be fixed by sanding with fine sandpaper and then polishing. However, for more severe cases, it's better to return to the repair shop for a repaint. Keeping the car body clean and dry before painting is crucial to avoid repeating the same mistake.
