2000 Passport questions

I need help with some issues on my 2000 Honda (read Isuzu) Passport.
1)The two rear passenger doors are VERY stiff to open. - It's almost like they are glued to the rubber door sill. The sills are crumpled over at the
top rear corner of each door. Could this be a cause?
2) Proper lubricant - Also, what is the proper lubricant for the thin metal bar that connects the door to the frame? I've tried WD-40, but that does not last very long.
3) Tar like substance - I also have a tar-like substance oozing out from the bottom of a couple of passenger doors, as well as the rear cargo door. Anyone know what might be causing this?
I live in Maryland and only drive 100-150 miles a week back and forth to work.
TIA, Hawkeye65

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