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@lae
meerlaan yeah basically all tubes and threads need to be masked, as does the fork steerer (otherwise you'll have to sand off the powdercoat to get the headset crown race back on!). Same with canti mounts and downtube shifter bosses if your frame has them.
Stuff like the brake mount holes, mudguard eyelets (if non-threaded), and seatpost bolt hole *can *be powdercoated but you might have to run a file through them to get stuff to fit. These areas are usually full of grease so if you have to remove a bit of powdercoat, rust shouldn't be a problem.
Make sure you do ask though, even if it's embarrasing. A powdercoater once forgot to mask off my derailer hangar thread - had to get it tapped out at a bike shop. Powdercoater paid for it, but it's still a pain(t) in the arse.