well i had a leak through where the bolt is in the rear window on the right side. so i ordered new bushes because i thought the bush had failed. removed the spoiler to find it had come unstuck on the right side. cleaned all the old tape off with panel wipe and put new bushes in the holes both sides and new tape either side of the spoiler. few days later, right side was unstuck again and leak still present but only in really heavy rain. can still see moisture around the outside of the bush when i've washed the car :bang:
took it to fiat, clueless as usual. i've just left it for now