Why Do Bubbles Appear on Car Paint When It Rains and Disappear When It's Sunny?

[LaJude]

Bubbles appearing on car paint during rain and disappearing when sunny may occur after repainting. During prolonged rain, the putty absorbs moisture and forms bubbles, which then subside when the weather clears. This typically does not happen with the original factory paint. Here are some related explanations: Causes of bubbles on car paint: The main reason for small bubbles on car paint is the entrapment of solvent air within the paint film during the repainting process, which later escapes, leaving bubble marks. This could be due to applying the paint too thickly, using inappropriate hardeners or thinners, insufficient drying time for the putty during heating, or uneven baking of the paint. Precautions: Use the correct spraying viscosity, spraying pressure, nozzle size, appropriate hardeners, and thinners. Ensure the putty has sufficient drying time and regularly check the air pressure and humidity in the baking room. Therefore, repainting should be done at professional auto body shops or 4S stores. If small bubbles appear on the paint, it should also be addressed at a professional facility.