What is the method for spraying automotive topcoat?
2 Answers
The method for spraying automotive topcoat is as follows: 1. Clean the car thoroughly; 2. If the car surface is too smooth, use 600-grit sandpaper to sand it until it feels rough, which facilitates paint adhesion and prevents easy peeling; 3. When spraying, maintain a distance of about 20 cm from the car, press the spray nozzle, and apply the paint evenly. Multiple coats will yield better results; 4. When applying multiple coats, ensure an interval of at least 10 minutes between each coat to allow the paint to dry and prevent sagging; 5. If sagging occurs, wait for it to dry, then sand it smooth with 600-grit sandpaper and spray paint from a distance to cover it; 6. After the paint is completely dry, apply a layer of clear coat to enhance gloss, protect the paint surface, and improve durability.
When I first started spray painting, I paid quite a bit in tuition before getting the hang of it—it's all about precision. Start by sanding the old paint surface with 1200-grit sandpaper to roughen it up, then fill scratches and dents with putty. The paint mixing ratio is especially critical; the base paint, hardener, and thinner must be measured precisely according to the manufacturer's instructions using an electronic scale. Hold the spray gun 20 cm away from the car and move it at a steady pace, applying thin layers and covering the surface in three passes for evenness. Wait 15 minutes for each layer to dry to the touch before applying the next, and make sure the final clear coat is thicker to protect the color. After finishing, bake it in the drying room for half an hour, then water-sand and polish to eliminate orange peel. The whole process is most vulnerable to dust contamination, so it's essential to work in a dust-free booth.
