i use West System Epoxy, and hotbox (80-90 d celsius) I have made lot of bows with it, glass and allwood, and never had failure. But i MUST use hotbox with the West System! After assembling, you must let the bow rest in roomtemprature for 1-2 hours before you start the hotbox cure. After 3-5 hours, i take it out from the box, and let the bow cool down. If you put the bow directly in heat, or dont use hotbox, you can get failure. (delamination)