What is the reason for not being able to find the cause of oil spots in paint?
2 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.
