Insignia next.....
I cut my own masks using a cheap Roland Vinyl Cutter but the process will be pretty much the same regardless of where you get yours cut.
I used to start by spraying the lightest colours first, but this ended up with awkward and often with paint ridges as it's very hard to flat back a paint edge without ruining the crisp edge. Now I have found Hobby Flight Enamel paints, the pigment is so good I spray in size order regardless of the colours involved.
The first mask has been applied to undersurface of the wing and the edge rubbed down with the back of my thumb. The first edge is sprayed lightly and left to dry to a matt finish (about 2-3 mins)
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Then a second all-over dust coat is applied. This should help to stop any bleeding under the mask.
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Finally, after another 2-3 mins, a heavy wet coat is applied. It looks patchy here as it has already started to dry by the time I could get the camera!
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After 3-4 hours, the surface is tough enough to remove the mask and give the surface a light flat back with fine grade sandpaper. You'll notice the 'border' that has been left on the surface, this is to align the next few masks to ensure each circle is concentric.
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Next mask applied, and same process as above (dust coat to edge, full dust coat and then a flow coat)
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4 hours later......
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And later the same evening........
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I can't figure out how the camera distorts the circles and makes the red look off centre. I had to rush back into the workshop to measure it! It's just an optical illusion, Phew!