Not something I would normally rely on.
But for reasons related to difficult access, and extreme difficulty in dismantling parts to the stage where I could weld, or drill and tap for proper fastners, I need to attach a mild steel "bracket" to one side of a zinc-plated inverted U-channel about 2 cm wide and deep. The potential contact area is about 20 x 2 cm and the loads are quite low and mainly in shear. It's not safety critical. I do have access to degrease and sand or wire brush the plated channel (and the bracket).
I'm thinking that something like No More Nails might be the best bet. In many geometries like plug and socket I'd be confident with epoxy, but here if it delaminates at one end, the failure could propagate.
It may be possible to "wrap" the new part around the outside of the channel, which would obviously provide more contact area and give epoxy a better chance.
What does the panel think?
ps it's a drawer runner on an Ikea cabinet, where I have reduced the depth of the drawer, but that means I've lost the "hook" that the back of the drawer engages to stop it tipping forward when opened.