Been trying to find the source of water leaks in our '06 Mustang trunk. I can usually find a couple teaspoons of water in the rear RH wheelwell after a typical Seattle rain. Flipped the rear seats down while parked in the driveway in a heavy Seattle rain and (while using a flashlight) found water seeping in at two locations. Both leaks appear to be between sheets of overlapping spot welded sheetmetal. One was below the RH taillight, the other was up higher, a couple inches to right of the trunk seal, but where two pieces of metal come together and form a small diving board.
Any suggestions how to seal these? Can I seal them from the inside of the trunk, or do they need to be sealed from the outside? (would probably have to remove the bumper cover and trunk hinge to put the sealant where it might stop the leaks) What type of sealer should be used?