I tried more casual approaches but the ends always bowed. I ended up cleaning out the pre-filled schmoo from the channel of the new seal and whatever it left on the car from attempting to install.
Once clean and dry I applied Gorilla Glue to the channel of the seal. I folded up smaller sized pieces of cardboard in a back and forth in a zig-zag fashion to build it up. I used a towel and crammed it into the trunk's folding arms with a couple/several pieces of the built-up cardboard pushing up against the seal for added pressure.
The scissor style arms of the trunk allowed me to adjust the amount of pressure by how far I had it closed. Left it like that for 24+ hours doing one side at a time.
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