just the bead or the collar?
the bead should work well..
I can't see any reason why it should fail prior the rim itself (cutting a curb will chip both)
the collar is a different story...
I jbwelded my crack back in (collar) on a much less expensive manco rim..
I haven't installed it to the kart yet.. so no real world experience.. but the tube and tyre are on and inflated.. no issue so far, increased the pressure a bit just to put some stress on it
(not scientifically bench simulating the kart load basically)
and it's still in one piece...
as you can see, I just "glued" the pieces back in.. with a bit of extra "beefing up" in the back.
here's a pre-painted pic of the repair I made..
post painted I don't have (only on my phone, one of the hundreds of pics I lost

)
But if you want, I'll take another one tomorrow, but it looks just like before, just white
'sid