i find it funny how people can post up other business but every time i say I do carbon dipping it gets deleted!
 
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I bet that spoiler hits the aerial when the tailgate is open!! The OEM SEAT ones have a cut out to miss the aerial
My son has a Mk 1 Fabia vRS the lacquer on his spoiler is flaking off due to contact with the aerial. This is a common problem with the vRS