Assembling a rather large cabinet that I used dowels to join a panel to a large corner post. the panel is about 48" high and has 12 dowels over the 48" span. I'm afraid I wont be able to get the pieces joined and clamped before the glue sets, so I normally use epoxy, (but I am out) which gives me plenty of working time and acts as a lubricant, allowing the joint to easily come together. I'm considering polyurethane, but have never used it. Never heard anything good about it either. If I use it, will it act as a lubricant like the epoxy and give me plenty of working time? Do I absolutely have to use water?