I fly R/C sailplanes and gap seals work. Nowadays, most sailplanes are molded with a wiper/gap seal build in, but back in the day (10 years ago or so) you would cut 1" wide strips of mylar and paint them with contact cement on about 1/2 of the width. The gap seal is always attached to the furthest forward part, so if you wanted to make a seal at the gap at the front of the drivers door, it would be glued to the front fender.
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