Hi. I wanted to make mine blue as well! Great collor!
However. Painting plastic surfaces isnt that simple. You should clean the surface thoroughly. You should also take some time to sand off the old paint (because you dont know what kind of paint it is) and prepare it for painting with a special stuff that makes the paint stick better (ask your local paint dealer).
That will do just fine.
Spray painting has another difficulty. You wont be happy with the surface if you spray paint it at home… there will be lots of dust on the surface of your new paint!
Instead of painting it at home you can just take the parts to the car paint shop. Let them paint it in their dust free cabin for 10 bucks! Result will be much better! The only question left for me is… shall I make it glossy or not?