This work will deffo cure it
I have had a cupra for 11 years and been bone dry for last 5
The places water come in are :-
Door ancillary carrier plates X4
Main wiring loom entry box in drivers side wiper motor scuttle
Bonnet release cable grommet in drivers side scuttle
Pollen filter enclosure houseing too scuttle panel joint found in Passenger side scuttle panel .
Pollen filter lid missing or misaligned, ditto
Drain holes at each end of wiper scuttle blocked
Rear wiper supply pipe leaking ( wet boot )
If you have done that lot you will be dry for ever !
If your still wet then you aint done one of the above correctly .........try again!