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If it's already faded, your best bet is to get it re-painted. Don't try to use a wax on it. You'll never get it all off, and the whole thing will have a white glaze. Looks worse than just being faded. My Dad had the top on his '88 painted. Looked awesome. Plus, with the glossy paint, he could wax it and keep it looking good.
Fiberglass! yes, that's what it is! So... painting is the way to go. I'm sure a special fiberglass paint is made with matching paint code for original look? Or is this gonna be a hit or miss type of thing? Moe than likely a spray job?