I have a 10 year old car that I will be doing some small body work repair on the passenger door with Eastwoods Premium Body Filler. The rest of the cars paint is in perfect shape except for a couple dings which I will also be fixing. After the body work on the door and the couple dings I planned on spraying just those areas with the Epoxy Primer and then sanding the whole car with 400 grit. Then I would spray the whole car with 2k Urethane Primer Surfacer so the whole car would have an even color to spray the final White Color and Clear Coat over. My first question is do I need to sand the whole car down again after I spray the 2k Primer Surfacer or can I spray the White Color and Clear Coat over it without sanding? Second question would be if I should change anything in the way I’m planning to do this. Thank you in advance for any responses.