There are many excellent specialty adhesives out there. I have used the System Three T-88 to build boats and make beautiful furniture for several decades. It's durable, waterproof, and fills in gaps when connections aren't perfect. Due to the amber color, good joints are almost invisible. He has enough working time to be able to collect, adjust and consolidate complex projects. The joints should remain closed overnight. When faster drying is required, System Three produces fast drying adhesives in 5 and 15 minutes. I only use them for special purposes where quick drying is required and long hours of work are not required. T-88 is my glue for most projects.