or a wheel refurbisher.. although by the time you pay for that you might be better just buying new arms off one of the traders.
It really is an easy job.
Sand off with wet and dry (whilst wet), clean arms and let dry.
Prime wait 20 mins prime again
Let dry and go watch the tv
Spray with matt black, wait 20 mins spray again
Let dry and go watch the tv
Turn over and spray the back
Let dry and go watch the tv
Refit
Simples