Sheet metal chassis to prevent rust need to spray paint, but can not be grounded, in fact, you want to conduct electricity, just make sure that you two parts of the contact surface can contact each other on the line. Means that the contact surface is not sprayed. A long time ago encountered this case, the final solution is the box body electroplating color zinc after the outer surface spraying.
Auto sheet metal rust spraying methods are summarized as follows:
1, the body of the rust and internal spraying: depending on the body of the body by the sheet metal workers to complete.
2, sanding and finishing beveled edges: use P60 to 180 sandpaper to sand the body after sheet metal repair and the need for atomic gray.
3. Dusting and Cleaning: Use Pressure Q and Silicon Remover Cleaner to remove fine dust and stains from the car body.
4, paint primer: mix 4:1 red primer and spray 1 or 2 layers of sanded exposed metal on the position, and then baked dry.
5, sanding atomic gray: the use of P60 to 240 sandpaper sanding, by hand or sanding indicator layer to check the flatness, pinholes and marks.
6. Spray intermediate paint: Mix 2 to 3 layers of multifunctional intermediate paint, 5 to 10 minutes apart from each layer, then bake dry 60 degrees Celsius for 30 minutes, then spray sanding indicator layer.
7, sanding intermediate paint: use P320 to 400 sandpaper to sand the dried intermediate paint.
8, dust cleaning: first blow out the dust spots on the body with a pressure gun, remove body stains with silicon remover cleaner, blow out the dust from the body crevices with a pressure gun, and finally remove the fine dust from the body with a sticky dust cloth.
9, topcoat spraying plain paint: spray 2 to 3 layers, each layer 5 to 10 minutes apart, with the temperature to add hardener and thinner.
10, spray primer: spray 2 to 3 layers of plain color paint, silver powder paint or pearl paint, each layer 5 to 10 minutes apart.
11, varnish spraying: mixing and spraying two layers of varnish, each layer of 5 to 10 minutes, with the temperature of the addition of hardener and thinner.
12, drying: leave 5 to 10 minutes, 60 degrees Celsius drying 30 minutes. Drying and curing need to be judged, if you feel sticky with a finger touch, the surface is dry, if the light touch does not leave fingerprints, is half-hard to dry, if the strong pressure does not leave fingerprints, is completely dry.
13, waxing and polishing, covering the car.