Iv used both 5 and 30 min epoxy and there both very Strong but i have never done a stress test on either. On all my kits and ARFs i use 5 min epoxy on the less structural areas like the impenage and radio trays exc. but always used 30 on atleast joining the wings and firewall, but theres so much time diff, between 5 and 30 min that im just itching to use the 5 on all parts except maybe the firewall. Has anyone used 5 on Major structural areas befor if so did it stand up to any rigorous flight conditions? THANK YOU