Spray the paper itself then start gently sanding the body of the vehicle. Also the reason for primer is that it is what providespreps the surface for finish painting.
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You will not have those sand scratches.
Should you sand primer before painting metal. Unlike other types of sanding wet sanding movements should be back and forth in a straight line rather than in circular motions. Prepping furniture to paint. That kind of stuff happens.
Finally just before you are ready to apply primer to the metal smooth the cars surface with a 320 grit piece of fine sandpaper. Choose your coarsest grit 600 if you are sanding primer or bodywork 800 1000 if you are sanding a finished paint job. This oily residue must be removed and the surface must be cleaned prior to priming and painting the metal.
When to sand when to degloss and when to prime. Keeping everything clean does not keep it from happening. For auto repair and other metals start with 60 grit paper if you need to sand down below the rust to repair deep scars.
Surface preparation is the key to success when you prepare metal for priming and painting. I dont have a phd in furniture painting but i have learned from my mistakes. To get the best possible finish when painting metal it is important to prepare the metal before painting it you should also chose a good quality paint and primer that is suitable for use on metal.
To properly prepare new metal surfaces use mineral spirits to remove grease and apply a rust inhibitive primer before painting. Then increase the grit to 120 to remove rust stains or shape body filler. Paint will not adhere to dirty oily surfaces.
Once the paint is laid on all nice you put your clear coat on it and its going to look beautiful. Some metals are pre coated with an oil that is designed to prevent rust from forming on the surface. As long as you lay your paint on well it should be perfectly fine.
Dont worry about it. For painted surfaces that are in sound condition remove dust with a clean dry cloth de gloss the surface with light sanding and wipe with mineral spirits to ensure good adhesion. Sanding keeps the quality of the paint finish smooth.
You have a good tooth thats going to grab that base coat that youre laying on. When painting over topcoats not primer then the sanding as you suggest is required. There have been pieces where the paint just peeled off where the old finish bled through or where the paint color decision wasnt exactly my best.
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