the glue gave at the bottom. Mine did the same.
You put the top up a little to relieve tension. Lift the backside out a little where the glue gave...wipe with alcohol. Put a 1 inch wide 3m VHS double sided tape and reseal like it was before.
I've been through very hot/cold and heavy rain. It has held without the tape giving. You have to make sure you get the real 3m VHS. The tape holds rear spoilers up to 175mph+ so I dont' see the tape giving anytime soon
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