Domiluk,I'm a painter,but I only use acrilic waterbased paints so any info I offered would not do you much good.
The only advise I can offer is as posted before paint the lighter colour first (on multicoloured paint schemes).I would also suggest that once you've masked off for the second colour that you spray the edge of your masking with the primary colour (in your case blue) to seal the edge of the masking.