My understanding of the ‘wet strap’ method is that the fibers in the strap will slide on each other more easily when wet so the webbing fibers can stretch on the initial tensioning rather than work towards its stretched length during use. I don’t know what this strap is made out of but polyester would have been the better choice since it has less inherent stretch, is stronger, and more durable than nylon.
Getting the strap wet would be more important for nylon since it has about twice the stretch as polyester.
I don’t think a wet strap will tighten when it dries; the water only helps the weave settle into its longest sate quickly.
If you’ve ever sat in a hammock you sometimes hear a ‘creaking’ from the straps, this is the fibers settling into their stretched length without the water as lube….
