To be honest mate as long as you don't lacquer it you should get a good finish with some rattle cans. I painted the plastics on my last Vr engine. Just scratch it up with some wet and dry, plastic primer them and then just blast it in what ever colour you want. If it doesn't turn out well then just let it dry, sand it off and start again! Get to halfords it will look 100 times better if you do this.