Firstly...How lucky you are to have a Corrado! Are you in Oz? Popup spoilers are a bit like sliding sunroofs. Lack of lubrication makes them sticky. Check the runners first. Use a body grease (you know, the white stuff) as it's less likely to get washed off. My Peugeot GTi suffered from a sticky sunroof to the point where the (plastic) cable stripped its gears. Expensive.
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