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first time trying the hairspray technique and it went pretty well i think. I wanted to weather it pretty heavily which meant that I scratched off all the paint on some spots but I found it easy to just reapply the base rust color with a brush where that happened.
Also I don't actually know if it's realistic that they are this rusted, sure in some pictures they seem pretty worn but they still have to withstand the pressure of firing without blowing up