Is repainting done directly on the existing paint surface?
2 Answers
Car repainting does not require completely removing the previous paint layer, but it does necessitate full-body sanding. The specific details of car repainting are as follows: Painting Method: First is the paint mixing process, where color matching must be carefully considered. Protective measures are essential; any areas not to be painted must be covered with newspaper or other masking materials. During painting, attention should also be paid to the spray gun pressure and working environment. Finally, the baking time is crucial. Overall Painting Sequence: The standard painting procedure typically involves: first, metalwork (hammering and leveling the metal body), then sanding the original paint and underlying layers of the area to be painted until it is two paint layers thinner than the standard surface. Next, apply filler (spreading putty into the concave areas to be painted and leveling it to form a base coat), mix the paint, spray the paint, bake it in a drying booth, and then air-dry for over ten hours to complete the process.
Repainting isn't simply spraying new paint directly over the old finish - that yields poor results. I tried it myself before, and the new paint quickly bubbled and peeled off. The proper procedure involves: first thoroughly washing the vehicle surface to remove dirt and grease, then sanding or grinding the old paint surface smooth to eliminate oxidation and rust. After sanding, a primer coat must be applied to improve adhesion - otherwise the new paint won't bond properly. This is followed by applying basecoat and clearcoat, with drying and sanding between each layer. For DIY, the tools are relatively inexpensive but time-consuming; professional shops use more precise equipment to ensure even color matching. The crucial point is never skipping the preparation steps, otherwise the paint will crack within months, making the effort counterproductive.
