Riggghhhhtttt..
Well .

..
I can completely guarantee you that Tarzan grip and acetone will work and will be clear and water resistant
I put it on my valves and bladder & canopy patches..as taught by other repairers over a decade ago .and go three or four km out on them and it lasts for years..it welds

I am v intrigued on if it would work on that bar material (plse let me know

)..but I wouldn't see why not ..it works on footpads..!
Plse note...sandpaper the bar and scuff it up..scrub with acetone (ooooooorrr...'nail polish remover with acetone')....then add the glue
Costs seven dollars max..
The ingredients of the two mixed together is exactly the same as other recommended glues
Also it withstands the heat
Goodluck!!