Volkywagen
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The section of roof that raises is aluminium. If you are tapping the front bit (above the windscreen) which doesn’t raise, then this is plastic.I need to look at my roof. Should I be checking that the tape had been applied. I only asked because when I tap the roof it sounds plastic rather than metal.
You should have the tape applied, it may be worth checking. You can easily peel down the black strip and see if it’s there, and push back the strip quite easily.
I wouldn’t worry for around 12 months from purchase, then take the black seal off and check for yourself.
I had the steel inside the black strip start to corrode, however with the tape present it would have prevented and damage to the aluminium roof paintwork.
Vw did however replace the full seal after I sent it in for it’s first service under warranty, so it is worth checking from time to time.
The very front section of raising roof doesn’t seem to have the foil/tape under the seal, so I may be adding this myself this summer.