If you take time to sift through the earlier posts to get past the trash and find the real threads on the subject (the search engine here really sucks!) you'll find references to some powder coating jobs with as many as seven (7) coats of powder, each one baked, then cooled for the next coat before being baked again. I agree with what Jerry says, anyone who's quoting $200 for a chassis coating job is setting you up for problems later. Are you confident in his painting ability?