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There are no glues that glue polyethylene, nothing on the market makes a chemical bond. However there are adhesives, but you do not want to use an adhesive for such an application; as adhesives are easily removable. Polyethylene can be melted together (welded), but you do not want to do that in this type of application.
So, your left with products that fill gaps, and provide a compression seal, which is what you are already doing. Goop and 3m's 5200 do a good job at this. But keep in mind, that they do not actually glue to the poly, so timely inspections and occasional maintenance need to be done.
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