I want to repaint my lip but not sure what color primer to use

 

Grey of course! If you plan on color matching skirt,panels what have you, its always best to use grey primer on lighter colors or go dark grey, red, or black according to what base you plan on using. Be sure to prep well and go at it. Don't just spray bomb it so it comes out looking like crap.

Go to a reputable paint shop and they can even give you a color coded oem paint in a can for small projects or if you don't have access to a compressor and painting guns and other tools of the trade.

Good luck