The application of rusty areas is now finished. Some of the more obvious blobs of wash have been either removed or significantly diminished in appearance. Simple wiping with a damp (white spirit) rigger brush, holding the bristles as flat to the surface as possible, will achieve this. The model was left to dry for an hour or so (measured in coffee consumption at the rate of one every 30 minutes) and then given a generous coat of Testor's Dullcote from an aerosol can. This part of the process achieves two things - it protects the wash finish in subsequent stages and removes the high gloss shine of the paint finish.
No masking was done. The whole model was covered.