What Causes Small Bubbles in Paint?
3 Answers
The reason for small bubbles in paint: During the car painting process, a large number of water molecules enter the middle layer of the car paint film through certain channels. If not thoroughly dried and removed during baking, these water molecules remain latent and gradually gather into small water clusters under suitable conditions. They then move between the dried intermediate paint film and the topcoat, forming paint film bubbles. Glaze Sealing: In addition to the benefits provided by wax, glaze sealing can enhance the strength of the car paint and prevent fine scratches caused by windblown sand hitting the car body. The effects last relatively longer, typically around 3 to 4 months. Waxing: Waxing is the most traditional and economical method for protecting car paint. Its primary functions include inhibiting oxidation from external harmful elements, providing UV resistance, and to some extent, enhancing the brightness of the car paint. Coating: Paint coating treatments are generally more expensive. They form a transparent protective film on the car body, offering better protection than waxing or glaze sealing. The effects typically last about a year.
Paint bubbles are quite common, and the reasons vary widely. The most common cause is an unclean surface, such as oil stains or dust, which affects paint adhesion and leads to bubbles. High environmental humidity is a major issue, as moisture in the air seeps into the paint layer, forming bubbles when the solvent evaporates. Improper paint mixing is also common—too much thinner evaporating too quickly or incorrect ratios causing reactions. Poor spray gun technique is a technical challenge; too high air pressure or holding the gun too close can blow air into the paint. For solutions, start with the basics: thoroughly clean the surface using professional cleaners to remove oil stains; choose low-humidity days for painting; mix paint according to the specified ratios; and maintain consistent distance while moving the spray gun evenly. If bubbles appear, let them dry completely, sand them off, and repaint. I’ve seen many beginners make mistakes by rushing—patience is key, and prevention is always better than repair.
DIY painting can be frustrating when bubbles appear, and I've learned this the hard way. Common causes include dirty or wet surfaces—I once ended up with a mess of bubbles because I didn't clean off grease properly before spraying. Over-thinned paint evaporates too aggressively, making bubbles more obvious. Moving the spray gun too fast or too close introduces air, worsening the issue. Prevention is straightforward: thoroughly clean surfaces with alcohol; avoid painting on humid days—wait for dry weather; follow the manual for paint mixing ratios; practice steady, even spray gun movements. If bubbles appear, stop immediately, let it dry, sand it smooth, and reapply. With patience and practice, problems diminish. Though small bubbles may seem insignificant, accumulated bubbles can lead to peeling, compromising both appearance and durability—address them promptly.
