Thanks for the replies, baddbob and Eddie.
To make something so simple in theory, a lot more complicated,
a few more questions...
Is RTV silicone, the kind that smells like vinegar, bad for bare steel? Is the type that smells more like ammonia better?
What about for a trim piece that snaps into a hole. Hard to describe but I'm sure you guys have all seen something like it...a tab shaped like a sharp "V" (think of a spring steel bent into a "V" shape) that goes into a round hole. Is there any simple way to seal this aside from a lot of goop around it? I'm thinking not and I'm overanalyzing this.