Hi Allan (Blacknbluedog)
Now this is a can of worms, in the past I have used
"Stixall" Adhesive & Sealant Clear - "Gorilla Glue" clear - Evo-Stick "The Dogs B*ll*cks" clear and 2 part epoxy, all slow setting times.
Evo-Stick "Sticks like sh*t" clear is a grab adhesives short setting time.
In the end for fixing the deck beams I all ways go for one of the new Hybrid adhesives with a slow setting time and most are waterproof.