Well, if you have all the shit to paint it, id say go ahead and paint it. But parts alone to paint the thing is going to be at least 300 plus paint... I got a compressor thats never been used and a hvlp gun that has never been used that you can cop off me if you wanna save a lil money.

Edit: And here are a few professional videos that show you how to paint bodykits, same principle will apply to your spoiler.
http://www.wingswest.com/techInfoVideo.asp