How to Solve Paint Bubbling?

[DeTimothy]

Use a needle to puncture the bubble to determine its depth. When the bubble occurs between paint layers, sand down the defective area to expose the intact paint layer and then repaint. Smooth it with soapy water and seal it with two-component surfacer.

[TheoDella]

I've been driving for almost thirty years and have dealt with numerous paint bubbling issues. The most common cause is not cleaning the car body surface properly before painting, such as rushing to paint when there's dust or oil stains, or when there's still moisture in the underlying layer that hasn't evaporated completely. Once, my friend's car door had bubbles, and I helped him by first sanding off the bubbled paint layer with 800-grit sandpaper, then scrubbing the underlying layer with industrial alcohol, and letting it dry for three days to ensure no moisture remained. When repainting, it's important to apply thin layers multiple times, with a twenty-minute interval between each layer. Finally, we chose a highly weather-resistant water-based paint. The rainy season in the south is the most problematic time for painting. Once, I didn't pay attention to the humidity, and it started raining right after I finished painting, causing the entire painted surface to bubble up like toad skin, forcing me to redo the whole thing.