Here's a thought...
Why don't you take the sunroof out, close all the doors, windows, airvents etc and then fill it up with water from the local fire hydrant, to the sunroof level...
You'll be able to walk all round the outside identifying any leaks without the discomfort of sitting in the car for hours watching for the odd tiddle...
Hope this helps...
Very best regards...
Ian
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1985 WR quattro, 1985 20vT RallyRep, 1993 MTM ABY S2 Avant. 2010 S3 Sportback.
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