What is the reason for not being able to find the cause of oil spots in paint?
3 Answers
Reasons for oil spots appearing after car painting: dust settling on wet paint, water in the spray gun. Below are detailed explanations of these causes: Dust settling on wet paint: After painting, the car paint is not completely dry, and some heavy dust may settle on it, creating a situation that looks like oil spots, requiring repolishing. Therefore, during painting operations, it is advisable to work in a dust-free environment. Water in the spray gun: Residual water in the spray gun can cause the paint to carry some moisture during spraying. Since water does not easily dissolve in paint, this situation occurs.
I recently encountered oil spots while spray painting my car myself. I spent a lot of time searching for the cause but couldn't figure it out until I consulted a professional. The issue usually lies in inadequate surface cleaning, such as oil residue from fingers or oil vapor in the air; uncleaned oil in the spray gun can also form small spots during painting; even paint cans left open for too long can absorb moisture and develop spots. It's recommended to thoroughly wipe the car body with a degreaser before painting, check if the spray gun is clogged, and choose a low-temperature, dry day for the job. If oil spots have already appeared, sand them smooth and repaint—don't rush the process to avoid affecting the overall paint finish and rustproofing performance. This is crucial for the car's appearance and long-term protection. Beginners are better off seeking help from professional shops to avoid repeated rework and material waste. Spray painting is a delicate task, and prevention is key.
Paint fisheyes trouble many people, and experience tells me that the inability to find the cause is often due to several commonly overlooked points. The car body may have residual wax or fingerprints that were not removed, preventing the paint from adhering; unstable oil pressure or nozzle contamination during spray gun use can eject impurities; improper paint mixing ratios can also trigger the issue. To solve it, troubleshoot step by step: first check if the surface is dry and oil-free, then wipe it with a clean cloth; adjust the spray gun pressure and distance to ensure even paint mist. Dust or moisture in the environment can also introduce fisheyes, so it’s recommended to work in a closed, ventilated area. Promptly addressing fisheyes can prevent paint cracking and corrosion—don’t underestimate the details, and practice more to master the technique.
