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VW WINGS RUST PDF
What the PDF explains is the reasons why the rust in the front wings has occurred - A design manufacturing fault which Volkswagen admit to internally by the existence of this PDF dicument!
Although, the foam pads were to reduce noise from Mk5 Golf DIESEL engines, they were also applied to other Mk5 Golfs in the range - Hence our problem.
it only applies to the front wings.
It's important to emphasise that this is NOT a standard VW warranty issue.
Also, a precedant has been set by all the dozens of Mk5 Golfs which have already been repaired free of charge regarding this exact issue.
However, if your wings paint thickness when measured has changed (due to aftermarket respray), VW can legitimately escape from their obligations.
I hope this helps.