Probably a bit overkill to use a spray gun, last time i painted any serious metal (the unassembled framework for a 200ft x 100ft warehouse), I just used brushes and a roller. I also used red lead primer, which shows how long it is since i did any hard work. Apparently is now a bit illegal. We then used some random gloss paint which the company inherited somewhere
did a quick search and found a red oxide primer from screwfix which will probably do you well.
http://www.screwfix.com/p/no-nonsens...ed-750ml/48712
The hardest bit will be prepping the container and getting rid of any old flaky paint. Let us know when you are planning to do anything, and i will come down and lend a hand
__________________
Tom
TLR 22-4 2.0, TLR 22 5.0 AC Elite,
Kindly Supported by Trackside Spares, TLR, Spektrum and Horizon Hobby