color sanding single stage

High end show cars tend to have a non-metallic base coat wet sanded to remove the waves and peel before clear coating. Unless you use a high flow base, problem with that is sags. It will lay and flow out like glass, but will take multiple sprays to get the film thickness you want. Once they are happy the base is good, then clear coat coat goes on. Wet sanding up to 2000 and maybe even 3000 grit. Then buff.