What Causes Bubbling in the Hood Paint?

[ZoeyDella]

Bubbling in the hood paint is caused by poor paint quality, improper construction conditions and processes, and excessive paint thickness. Poor paint quality: The intermediate coating has relatively poor sealing ability. If there is moisture in the primer or intermediate coating, it can evaporate through the micropores of the paint film. However, the topcoat layer has a relatively stronger sealing property, especially for two-component paints after complete curing. If there is moisture trapped within the paint film, it cannot evaporate. Under the influence of weather temperature and the expansion of underlying moisture, localized stress on the topcoat film can cause bubbling. Solution: Use high-quality paint for touch-ups. Improper construction conditions and processes: Paint application requires strict conditions and techniques. The surface must be completely free of moisture before painting. The initial surface filling (putty) must be thoroughly dried in a dry environment before entering the paint booth for spraying. The air pipeline connected to the spray gun must remain dry, with no trace of moisture. These factors are also significant causes of paint bubbling. Solution: Visit a reputable repair shop for touch-ups. Excessive paint thickness: Lack of attention during the painting process or limited technician skills can often result in an overall paint thickness that is too thick, causing the paint to sag. Additionally, improper polishing afterward can set the stage for future paint bubbling. Solution: Seek experienced professionals for touch-ups.

[Oliver]

The hood on my previous car also bubbled several times, mainly due to corrosion. When the metal surface is exposed to moisture, it rusts over time, and the rust expands under the paint layer, causing bubbles. If you don’t dry the car promptly after washing, water stains can seep in and make this issue worse. Hot weather accelerates the problem—thermal expansion and contraction of the paint layer can cause bubbles if there are any defects. I’ve also noticed that if the surface isn’t properly sanded or if there’s grease on the base layer during repainting, the likelihood of bubbles increases significantly. To prevent this, try to park in dry spots, regularly inspect the paint for minor damage, and address issues early. If you spot rust, touch up the paint immediately to prevent spreading, otherwise the entire paint layer may peel off.

[GabriellaDella]

I just bought a used car, and there are quite a few bubbles on the hood, which is quite annoying. I asked a car-savvy friend, who said it might be due to trapped moisture that didn't drain properly, getting stuck under the paint after washing or rain, and then bubbling up when exposed to sunlight. Additionally, impurities during painting or improper drying can cause similar issues. The problem becomes more noticeable in hot weather, as the paint layers expand unevenly, forming bubbles. I also looked it up, and rust is another major culprit, as metal corrosion causes the paint layer to lift. Regularly rinsing with a mild cleaner and avoiding water accumulation in crevices can help reduce occurrences. Don't ignore small scratches, as they can allow water to seep in, increasing the risk of bubbling.

[LeGrant]

Bubbling on the hood's paint is mostly caused by rust or coating defects. Rust forms on the metal, causing the paint to bubble; insufficient sanding or contamination before painting can lead to uneven paint surfaces and bubbling. Long-term moisture accumulation can also cause this issue, even from something as simple as parking the car before it's fully dry. Keeping it dry is key.

[LaOwen]

Seeing bubbles on the hood makes me frown. It's usually caused by high temperatures and prolonged sun exposure leading to paint aging and expansion, forming bubbles. Alternatively, contaminants like grease under the paint can react over time and cause bubbling. Improper car washing allowing water seepage is another reason. Prevention involves regularly drying the surface and avoiding strong acidic cleaners, which can damage the paint.