Since the weatherstripping was old, cracked and generally dried all to hell, I replaced every seal with a complete kit from SoffSeal but not before the dried up trunk seal allowed enough moisture in to make the trunk floor a little scaly so I stripped the floor and painted it up with a quick coat of POR 15. This is supposed to be the rusty sheetmetal one-time-fix cure-all. Just keep it off your skin or anything else you don't want to be black forever! They even warn on the can to keep it out of the grooves of the can or the lid will go back on permanently.
A little carefully cut carpet and some sound deadener and this will be a distant memory!