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Well being in a snowy environment, the inevitable has happened and I'm starting to get a little rust and bubbling above the rear wheel on the inner lip of the quarter panel. Any advice?

Sand it down and respray the area. Only way to take care of it. At least it's under the lip and not on a body panel.

I had my roof sanded down and resprayed bc of rust.  Luckily I have a connection with a body shop.

My dad and uncle each own one. Just don't want to bother them. I know to sand and paint more interested in preventing. My Dad oils the undersides of his cars.

Undercoating. You can get it in wax or oil based. Where I live it's a necessity if you want your car to last longer then 5 years with our weather, salt in the winter months and just the salt off the ocean in general.

Funny enough out of all the brands and stuff I've used the best I've found is from wal-mart ( assuming they still use the Crown brand) the undercoating for the under side of the car is nice and thick and holds up very well. While the interpanel  coating (the stuff they spray the inner side of you panels trunk and such with, they drill little holes to get access then plug them after) is semi-runny and creeps well, which is what you want.

Also do your body work before you get the undercoating. There is nothing worse then trying to do body work after a fresh undercoating, you'll only run into problems.