What is the process flow of sheet metal painting?
3 Answers
Surface contaminants such as dust, stains, adhesive residues, pencil marks, etc., must be treated. Any exposed nail heads should be countersunk 1-2mm below the wood surface. When applying the primer, ensure proper dilution. Brush the primer evenly along the wood grain from top to bottom and left to right, applying two coats. The primer requires at least four coats in total. When applying putty, ensure it is applied generously and slightly raised above the wood surface to allow for drying shrinkage and sanding. After the putty has dried, sand it with 360-grit water sandpaper. Avoid sanding through to the base layer. If the base layer is exposed, promptly perform color touch-up repairs. Before spraying the topcoat, clean the work area thoroughly by sweeping and dampening the floor to ensure a dust-free environment. The topcoat must be filtered before application.
When the car has scratches or dents, I start by carefully inspecting the damage to determine the extent. Next, I remove the affected parts, such as lights or bumpers, to facilitate better access. Sanding the damaged area to remove all old paint and rust is a crucial step, using a grinder or manual sandpaper to ensure the surface is clean and dry. Then comes the body repair: gently hammering out the dents or using body filler to smooth out uneven areas, followed by waiting for it to cure. When applying primer for rust prevention, spray an even layer, then sand it smooth with fine sandpaper after drying. For the painting stage, choose a color that matches the original factory shade, applying it in layers to avoid drips, and then bake it in a high-temperature booth to strengthen the finish. Finally, polish and wax to restore the shine and reinstall the removed parts. The entire process takes about two days, requiring tools like a filler gun and spray equipment. Improper handling can lead to paint bubbling or rust, so professional operation is essential.
I once watched the repair shop technicians handle the scratches on my car door. They first assessed the extent of the damage and removed related parts to avoid paint contamination. Then, they carefully sanded the surface to remove rust spots and old paint layers, with a sizzling sound. The most interesting part was the metalwork, where they used professional tools to carefully reshape the dented area and applied thick filler, waiting for it to dry. After applying the primer and letting it dry for half a day, they sanded it smooth before starting to spray the new paint. The color was matched almost perfectly, and the spray gun was wielded evenly. Then, it was baked in a high-temperature booth to set the paint, and finally polished with a machine to finish the job. The whole process took two and a half days and cost a reasonable amount of about one thousand yuan, but the quality was durable. Remember to choose a reputable workshop with complete equipment to minimize mistakes.
