The bird we recently rescued came with two cages, one that he lived in and one that was outside for some time. It is fairly rusty, but is an enormous and beautiful cage. I was wondering if i took a lot of time and scraped all of the rust off if there is a special paint i should be using to repaint it. Would just spray paint be ok? I dont want him to nibble it off and become toxic to him. Any suggestions? Thanks!