The Henschel looks fantastic, John. The perfect result of a lot of very careful, skillful modelling. Interesting that you learned the prop masking technique from Rodney. Without knowing about Rodney's article, I came up with a nearly identical approach for my Buffalo build, making a paper tube kept to the right diameter with a cylindrical marker with masking tape on the inside.
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I also showed a perhaps easier technique (which I haven't personally tried yet) using rubber heat shrink tubing that works well at smaller scales. In any case, the effect of the masking you have done is great. You went farther than I did in getting three colors, keeping the white band exactly even in width. BTW, I am not sure you necessarily needed a more matt finish. Just my humble personal opinion but , based on photos of real warbirds in the field, I think it looks quite authentic the way it is. I've also found that models I have matt coated look a bit glossy when the paint is fresh and fade to more matt/eggshell after a week or so. Just my two cents worth.