Did you undercoat it first?
Painting tips ( I do this a lot

) 1 take some smooth wire wool to what ever surface you are spraying ( this gives the paint something to "stick to ,smooth plastics ect, the paint "slides off")
2 Undercoat it with at least two coats of primer, Use gray primer if spraying black or dark colours, use white primer if spraying a bright colour eg Red, green or
or blue or even white.
3 Be patient, allow to dry overnight between coats, (Resist the dark side urge to pick it up and play with it) this will minimise the risk of getting your
Fingerprints forever ingrained on your painted surface.
4 Enjoy what you are doing, dont see it as a chore or a task (I enjoy painting and spray painting It brings out my calm inner jedi)

Hope this helps Kalibos