I need to rebuild my rotten raised bed. This time, I want to use 4"x4"x8' lumber to make a bed in 16' long and 12" tall. But I'm thinking to use Titebond 3 Ultimate wood glue instead of metal fasteners. The reason is fasteners put too much stress at one point but blue will distribute the stress to all surface.
But with Pacific NW weather on the west cascade, I don't know if TB III Ultimate will hold up or not since I haven't used it on any projects that constantly exposed to moisture.
Best Answer
You're not building a deep space probe where you need to optimize everything as much as possible.
Screws and nails are plenty suited to the job. We've been building buildings with screws and nails for thousand of years.
If the wood is rotting, solve that problem. It won't matter what means of joining you use when everything is rotting anyway. Use good pressure treated lumber and good screws and your garden bed will hold up fine.
Titebond 3 or epoxy will work, but it will take much longer for no advantage whatsoever.