Bob Smith Slow-Cure Epoxy 30 min. forms the strongest bonds, is waterproof and more heat resistant than any of the other epoxies in the range.
Of course when using it for bonding the only problem is the length of time needed to cure; for handling there is a wait of 8 hours and full strength isn’t attained until the 24 hour mark is reached. To very well take advantage of it’s strength use it to fillet already formed joints. It can be mixed with microbaloons to form a putty-like consistency which is ideal for the task, although using this technique does slow down the curing time, by around 25%