Discovery post decals and a spray of Tamiya Flat Clear. A very tired kit, saved by a superb and imaginative decal sheet, including cockpit surrounds, etc. Still let down by the tail cone, which simply does not fit. To anyone else attempting this model, I would suggest forgetting the prototype, and building the model with the engines exposed (the parts are good), and leaving the cone off.
I'm pleased with the patchy, grubby effect achieved. If you really went to town with the patch masking method I used, you'd achieve an excellent result. Will attach to the 747 SCA during my next modelling evening.