here was my solution: i wanted something temporary enough that i could still replace the wing if i ever wanted to, but something permanent enough that it would look decent and not leak. i put good old (yellow!)duct tape across the the holes from inside the trunk. filled the top of the holes with indoor/outdoor spackle and made is as flush as i could. then put several layers of matching touch up paint over the spackle but within the outline of the holes. difficult to get a decent photo of the fix, but here you go... most people don't notice it unless i point it out to them.
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