We needed to use an adhesive not prone to the problems we'd seen in competing products.
We found one we preferred and tested it.
We had fun proving just how strong it really is. It's the same adhesive used to fix Extraglaze Secondary Glazing panels to window frames. The amount of adhesive used in this test is the same as we would put around the edges of a panel of size 1.2m wide by 1.2m tall.