Are conventional or pre-glued dowels better?
A proper diameter dowel, in a proper diameter hole, applied by an automatic machine will produce a stronger joint with a pre-glued dowel than with conventional glue. This occurs because glue applied by an automatic machine does not coat the entire circumference of the hole, as water will. Anytime an improper fit occurs because of the dowel or the bore, conventional glue will produce a stronger joint. The primary reason is because a pre-glued dowel will not fill any voids.