harlow.. wanna ask some Q..

1) if wanted to spray gold onto the parts to make it bling..
first the, base muz be dark colour e.g: black rite?

2) isit neccessary to sand it down after/before spray?

actually i wanted to spray on the "poo" colour of SF.. but not sure the outcome will turn out as in wat? i tink i'll be using tamiya gold spray can..

thx for helping =)