Ulfhedinn
-Skill Collector-
All of our plastic bubble compasses are glued to Kydex compass boards with marine goo. Still going strong after 3 years.
I also used it on a polyethylene neck ring with a whites Vinyl drysuit Liner when nothing else I tried would bond permanently.
I find that e6000 dries less flexible than marine goo.
Is this what you are talking about?
https://www.amazon.com/Amazing-GOOP-170011-Marine-Adhesive/dp/B081XMZQPJ