its a pain in the arse even with bog standard matt paint!
where it's at on mine (and really, where you should expect it because of the construction?) ---
Front wheel arches (rears mysteriously ok - all 4 are dangerzones on any car without arch trim after all)
Couple of random bits on the panelling from neglected stone chips and scratches (previous owners

)
Bottom and rear edges of doors (including a tiny bit round the tailgate and rear lights)
and the bottom halves of the metal strips separating the two bits of glass in the front windows - both of mine are completely wrecked with rust! Inside as well as out

.... sanded it off, kurusted, zinc primered and topcoated it (even though it was originally plastic trimmed) as best as possible, but its still getting worse)
With the crap sealing job done on the new door i also expect it to go rotten on the inside within a couple years
