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Excellent tip Andy. I hope to regain the drive to make my way downstairs at some point but this summer has been very busy between air shows and vegetable garden.I've not worried about overspray Geo. I would make the mix very thin and, like you say, use low pressure to paint very close to the surface. The combination has little impact on surfaces that are further away but if your are worried, just hold a piece of paper to shield the area.
When spraying your demarcation line, for best results, hold the brush at an angle and spray away from the line and into the area to be filled with that colour. This gives a tighter spray pattern than blowing straight down.