hairline crack rear end housing

If it's the same Devcon product I'm familiar with it is as tough as nails. I haven't compared the 2 (JB and Devcon) but they told me it's better than JB. I used to be a mobile forklift mechanic for Hyster in St.Louis and serviced forklifts at Devcon. It was an extremely sloppy place to work and I remember very well one time going into check the brakes on one of their lifts. It had been setting for a few days and the brake drums were glued on so tight I couldn't budge them with two 5' pry bars and a helper, LOL... I laugh now but it sure wasn't fun then. Had to send it in to the shop and they had to torch the drums off. Even knowing what I know about Devcon I think welding is the way to go because that'll stop the cracking (if you drill each end) where-as a devcon or JB weld job most likely won't.