That issue will not be as easy as removing a light scratch or How to Remove Coffee Stains from Car Seats, therefore how to fix bubbling paint on car would be based on the size of the area and how much that bubble or blister paint affected on car body.
Before going for following remedies of how to fix bubbling paint on car, we need to know, why and what caused this to happened?.
What causes paint to bubble or blister?
Bubbling with paint is yet another way of saying blistering with paint.
Painting in direct sunlight or on a surface that is too hot
Application of an oil-based or alkyd paint over a damp, wet surface
Exposing a fresh paint film to dew, high humidity or rain
Moisture passing through interior walls from common household sources such as bathrooms, kitchens and laundry rooms
Determine whether heat or moisture has produced blisters. Break it open and inspect the blistered paint substrate and back side.
If only the newest coat of paint is blistered or bubbled, the blister was probably caused by heat.
If there are many layers of paint in the peeled blister and the raw surface is exposed, it is likely that the blister was caused by moisture.
Solution of how to fix bubbling caused by Moisture
Fix loose caulking and improve ventilation of the building to avoid a recurrent problem.
Remove the bubble by scraping or sanding down to the bare surface.
Prime all bare areas with a high-quality primer.
Repaint the surface with a high-quality paint in the desired finish.
Solution of how to fix bubbling caused by Heat
Through scratching, sanding or pressure-washing down to the base layers of paint or primer, remove the blisters.
Repaint the surface with a high-quality interior/exterior paint (make sure the surface temperature is below 90º F).
To clean off the paint that has bubbled up from the rust, use a putty knife or metal scraper.
Rub the sandpaper over the rusted area in a circular motion. Repeat this process until you have removed the layer of rust, or have reached bare metal.
Blow away the dust, then dampen a clean cloth with Mineral Spirits. Wipe the area to remove any of the dust and dirt that remains. Wait for 5 to 10 minutes for the Mineral Spirits to dry.
Use the paintbrush to add primer to the exposed metal.
Mix a small amount of body filler until it is the consistency of peanut butter. Apply the body filler to the depression with the putty knife. Wait for the body filler to harden.
Using sandpaper, sand the body filler until it is smooth and level with the surrounding metal.
With rubbing alcohol, wash the region with a clean towel. Apply the region with touch-up paint so that it mixes with the new paint.
Will painting over rust stop it?
Yes, it does. Rust is weak, but any color on it is weak to keep. Water and atmosphere touch the metal and continue to erode it as long as the paint film over the rusty portion is broken, resulting in more paint film being lost. So the elimination of all corrosion from the surface being painted is crucial.
How do I stop paint bubbling?
Made sure the surface is dry and clean.
Over some stains, add the primer-sealer and let it fully dry.
Prime New Latex Primer Joint Compound.
In hot or humid conditions, stop painting.
Before you expose the surface to moisture, let the paint dry entirely.
Should you pop paint bubbles?
If the paint bubbles come up, what to do? Don’t touch them if paint blisters ever occur. Giving the wall time to completely dry and recover by scratching, patching, sanding, washing, and repainting before resolving the problem.
Why is the second coat of paint bubbling?
The surface or environment of the painting was moist.
Car Paint Bubbling after Respray?
When the paint or primer coat was applied, moisture in the paint or primer coat created this. It might occur suddenly or, as you discovered, gradually over time.
Second Reason: Keeping the vehicle under a cover is not a smart idea since any cover that contacts the car can cause this by trapping moisture between the car and the cover, which then finds its way into the paint.
How To fix it?
If you can’t live with it as is, the only solution is a bare metal respray.
Ibrar Ayyub is an experienced technical writer with a Master's degree in computer science from BZU Multan University. He has written for various industries, mainly on home automation and engineering. He has a clear and simple writing style and is skilled in using infographics and diagrams. He is a great researcher and is able to present information in a well-organized and logical manner.