the epoxy you get for Canadian tire, so called 5 min epoxy is not strong enough for this kind of application.
use this one.
http://www.westsystem.com/ss/g-flex-epoxy/ , the kit cost 25 dollars. lee valley has it. Check their website to see where to buy.
It takes 7 hour to cure and 5 days to get full strength. It is used to fix boat. I used it. It is very good,and easy to work with.