hi sam, welcome to the forums!
but what's with the 'thumb down' image, r u bummed about something?
the front/read endcaps on the args are galvanized steel and can be painted like most auto body panels...
BUT the rest of the shell is ALUMINUM and must be prep'd and painted correctly or it's a wasted effort.
the paints need to flex/expand more than typical auto paint...
and there are a dozen other related issues.
here are some threads to get ya started...
using the right materials and prep a freshly painted arg' is a pretty thing...
for years and years.