Dragon 1/48 Junkers Ju188E-1 ‘Rächer’
I built this one back in 1994 and it was finished in the markings of an aircraft from KG6, Erprobungstaffel.
If I remember correctly most of the lower surfaces were painted first. They were sprayed with a coat of flat black that had a few drops of red brown added. Panel lines were highlighted by carefully spraying them with pure flat black. The upper surfaces of the model were then given a hard edge splinter cammo scheme of RLM70/71 greens. Over the top of this a very carefully sprayed lattice pattern of RLM76 light blue was applied. This pattern varied, being heavier on horizontal surfaces of the wings and tail. A much finer pattern was applied to the fuselage, engine cowls and vertical tail. The lower surface black mix was then carried on up the sides of the fuselage and engine cowls overlapping the 76 lattice at the desired demarkation lines.
The BMW radial engines used on Ju88 and 188 aircraft always seemed to run very dirty. The heavy exhaust stains on the upper and lower wing and tail surfaces were added using a very thin mix of about 20% flat black and 80% red brown. These were built up gradually and were heavier along panel lines and around any hatches. Any chips or scratches were applied with a Prismacolor silver pencil.