Pics:I have been told that Tremclad is difficult, but not impossible to spray. I forget which type of thinner was needed and how much to use but was told you have to get it right or it won't spray properly; gun will clog or spatter the paint instead of spraying it. You should definitely research this and maybe experiment on a test piece first or use a paint that has been designed for spraying.
I would have thought a wire wheel would have left scratches that will be visible through the paint. A brush could hide those marks but a spray likely would not. For what its worth, those are my thoughts.