Flexible Vinyl Mender?

I’ve got a few strap plates I want to glue on, and was hoping to get the promised tips on using this stuff before I go for it. What beyond the package direction ought I to know?

Forged ahead. Used a thin coat on each side, let it dry for a minute, pressed together, cure overnight, bead of aquaseal around the edge. Solid. Cleaned each surface with alc and emery paper first.