surely not ?
Yep! they go rusty inside as well you know. Just have to remember to run the abrasive wheel round the friction surface inside the drum to deglaze and remove the paint. Having used hammerite of all types on rear drums, I can tell you it ain't even nearly heat proof. It always burns off on the circumference although remains OK on the rest of the drum. For those whose drums are OK with Hammerite, maybe your rear brakes are'nt working!
I just leave mine rusty, it's less work & no hassle whatsoever. Took them off & ground flush the wear ridge in the summer before fitting new shoes & general cleanup of moving parts. Next time round it'll be new drums & they can go rusty as well, as long as they perform well. I suppose though I'm lucky that I don't have pram wheels fitted, just the standard 16" alloys & although you can see them it's not a problem.