Where does this water get in?

Just got an MOT for my MGZT-T 190 after fitting a new nearside sill and rear suspension rebuild. The sill was really rotten so was a bit worried about protecting the new one.

Jacked up the car today to fit a new rear engine mount and about a mug full of water ran out of the new sill!!! Where does it get in? I sealed the sill trim with tiger seal and the car has only been out in a light shower and only driven 7 miles to the MOT and back, before it was under cover. The whole repair is sealed up and the sill sprayed inside with Dinatrol so I hope it will stay rust free. But where does the water come from?



I'll be very grateful for any clues. By the way no water from the offside sill.

from the last news http://ift.tt/1BgmQDi

via IFTTT