I was thinking of using a backer rod and sealant to seal between the plastic and the window.
But which sealant is diffusion-tight?
It should also be age-resistant, and the backer rod must withstand it.

Silicone?
 
Butyl sealant is usually used for what you're going to do.
 
Matti_75 said:
You usually use butylfog for what you're going to do.
Thanks!
 
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