Mine took 1 good coat over the blue but thats with proper standox automotive paint that you use with a spray gun, Its thick and covers well. I just used a small art brush but it is very very fiddely, you need a good sterdy hand as jamie will have discovered. The touch up pens you buy such as the halfords ones tend to has paint in thats p**s thin so it never covers very well.
Nice job tho Jamie to say they were done at home with rattle can from halfords. All mine are done in a proper spray booth with proper automtive paint.