you can try shooting unshaken cold primer from about 20" away.
it's not gauranteed and it's not in any way consistant.
try on a random bit of scrap first before doing it on kit parts.
you can also do short bursts into air in a contained environment and let the primer have time to dry and settle onto the kit parts.
again, you'll need to test this to find your own optimum spray/height/temp etc etc.
AND it takes a while to build up enough.
DON'T spray too much or you'll get larger wet spray from the nozzle.
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