Are you going to gold plate it or paint it?
Gold paint usually sucks big time and has no shine. But, I have found an alternative that has worked for me in the past. First spray it with regular primer, then give it a coat of gloss black. After the black has fully cured, spray several light coats of Krylon Brass.
This has given me the best results on large objects. But if you have the time and money, pick up a couple of Gold Leaf paint pens (I believe they are krylon as well). They give the best gold finish of any paint I have ever used.
-Fred