I bought a used WRX wagon last summer that had an aftermarket sunroof (big mistake). Anyway, now that the rainy season is here I've noticed a slow leak. The headliner alongside the driver's side of the car gets damp between from the front windshield to back of the rear passenger door. Because the headliner will get damp even when that side of the car is facing uphill, I'm not actually sure that the leak is coming from the sunroof itself. My thought is that it might actually be coming from near where the roof rack attaches to the roof.
Anyway, to diagnose where the leak is, I want to tape off the sunroof and roof rack pillar. Does anyone have any suggestions on what kind of tape to use that is waterproof but wouldn't be too much of a pain to take off later?
Thanks for any help, I'm not looking forward to trying to fix this problem.