okay guys before you say anything i’ve already tried searching this and couldnt find anything specific. how would you go about painting or dyeing an aluminum yoyo? would you have to powder coat it? any help would be great. thanx!
Anodizing is a method used for coloring metals. 
sharpies ;D (really works) to cover dings
there has to be another way besides annodization. if someone really wants to colour their yoyo an airbrush is good, but you cant mask the yoyo beforehand unless you want rough spots.
If you want to paint your yoyo here is a video
Or you could just as Brett (Ibanezcollector) to paint one for you. He does solid work.