i might try some of that 3m flexible strip caulk - maybe not permanent but it works incredible well to seal weird gaps and cracks in uneven surfaces and joints.
https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Strip-Calk/?N=5002385+3293194020&rt=rud
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Andrew
Montclair, NJ
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1982 300D Turbo
120k
Petrol Blue Green
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