Is repainting done directly on the existing paint surface?

[McVictoria]

Vehicle repainting does not require completely removing the previous paint layer, but full-body sanding is necessary. The specific details of automotive repainting are as follows: Painting method: First is the paint mixing process, where color matching must be carefully checked. Protective measures should be taken, covering all non-painting areas with newspaper or other masking materials. Attention should also be paid to spray gun pressure and working conditions during painting. Finally, the baking time must be controlled. Complete painting sequence: The standard painting procedure generally involves: auto body repair (hammering and leveling metal panels), sanding down the original paint and primer layers on the target area to create a surface two paint layers thinner than standard, applying filler (spreading putty into depressions and leveling it to form a base coat), paint mixing, spraying, baking in a paint booth, followed by air drying for over ten hours to complete the process.

[DelBlakely]

When I repainted my beloved car last time, I found that spraying directly over the old paint simply didn't work! You have to properly sand the old paint surface first, otherwise the new paint layer won't adhere well and will easily peel off. I had to use sandpaper to roughen the entire surface, removing any wax or dirt, then thoroughly clean it to ensure no dust spots. During the process, scratches on doors needed to be filled with putty before applying primer to enhance adhesion. Controlling air pressure and spraying distance is absolutely crucial during painting - otherwise you'll get bubbles or uneven coating. Now the car looks brand new, but if I'd skipped the sanding step, the paint would definitely start peeling within months. In short, patiently preparing the old surface is key to success - spending extra time now is better than regretting it later.

[SanRylee]

From my repair experience, repainting is definitely not just slapping on new paint. You need to assess the condition of the old paint—if it's smooth like new, just lightly sand it to create microscopic roughness; if there's rust or peeling, you must use professional tools to completely remove the old layer. After that, clean off the dust and apply primer as a bridge. Every time I perform this operation, I use masking tape to protect the surrounding areas to avoid overspray. Painting requires even coverage, and temperature and humidity must be controlled properly—proper indoor ventilation is a must. If you forget these steps, the new paint will quickly crack or yellow, which is not worth the effort. Checking the paint's integrity during maintenance can greatly extend the car's lifespan.

[MacMaverick]

When I first got my new car and it got scratched, I thought I could save money by just spraying over it. The result was disastrous! The paint started peeling within months. Consulting an expert, I learned that before repainting, the old surface must be sanded off. This not only removes dirt but also enhances the adhesion of the new paint. In practice, after sanding, you need to clean off any residue, apply a primer, and then coat it. Now, every time I touch up the paint, I first address any surface defects to ensure long-term durability.

[KathrynDella]

When discussing car detailing, I find the principle of repainting quite fascinating: the smooth surface of old paint repels new paint molecules, leading to adhesion failure. Therefore, it's necessary to first create texture using sandpaper or equipment to increase surface area for paint penetration. Cleaning agents to remove grease are crucial, otherwise bubbling may occur. After spraying, the curing process involves chemical bonding, requiring a balance of humidity and ventilation. These details can prevent fading or cracking, ensuring color matching remains consistent.

[DiSpencer]

As a daily car user, I always remind beginners about repainting: don't think you can just cover it up directly, you must first sand the old paint to remove impurities. I would go to a professional shop where they evaluate, smooth the surface, clean it, and apply primer to enhance durability. During painting, control the layer thickness—not too thin or too thick—and also consider color blending. Skipping preparation steps is too risky, as the paint layer may peel off, affecting both appearance and safety. Regular paint maintenance can reduce the frequency of repainting needed.