I've spent 70 quid on new bits for this oil immersed welder I bought a whil e ago and it's now back in top condition electro-mechanically speaking. But the outside casing has been badly neglected and most of the original paint is gone. Anyway, I've splashed out on some Hammerite (hammer finish type) in dark gr een to maintain the original colour and was wondering the best way to apply it for an even finish. I've no access to sprayguns so I thought about usin g a small foam roller for the purpose. Would that do the trick or has anyon e a better suggestion?