Mr. Lee,
I do not think that JB would work in this situation.
I  know that 3-M has a polyurethane, pollystyrene repair kit for bumpes
that will work.
The problem I see is the place you are tring to repair, which is a
difficult area.
Buy new nad be done.
Good Evening,

Fred

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Hi , I have an 83 1/2 waterboxer , My engine coolant expansion tank has
a 1/2 inch long tube coming off the neck of the tank , the hose that
leads from the expansion tank to the filler tank fits over this tube .
Unfortunately this tube got busted off the neck of the tank, now I have
nothing to clamp my hose onto .
My question is, would JB weld be something that would work effectively ,
reliably and durably to reattatch my nipple/ tube to my expansion tank?
Any thoughts or ideas welcome
Thanks