Exterior door cutout need priming

Does the cut sheet metal for the lockset need corrosion protection? I assume the galvanized coating is on the front surface only.
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Well it is steel. That will rust if it gets wet/damp. Water shouldn't get in there but if it does you risk rust dripping out. Trash the door paint. Sorta makes sense for a warm-fuzzy to put something on it doesn't it? Not like it's some major thing to put on.
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that may run down behind the trim ring. If the door is still in primer, hit it with a spray can, otherwise just paint the door with the knob assembly removed. Where did you find a non-predrilled steel door? I haven't seen one of those in years and years. These days, they all have premade reinforced spots for the striker and hinges. Or are you adding a deadbolt to a one-hole door or something?
No, rusty knob holes aren't common, but I have seen streaks dripping down from the knob area. And I have seen plenty of rusty knob guts- some sort of rust-preventing spray on the innards before you button it up is a nice touch for the next guy.
aem sends...
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It was predrilled but you can see the raw steel edge in the lockset cutout. I also have a non-predrilled steel door that I'm trying to figure out how to cut the 2" and 1.5" holes w/o a special $30 holesaw. So far, in practice, it looks like a 24 tooth metal jigsaw blade with a 1/2" starter hole will work.
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