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is this thing just a tiny little leak, like a weeping drip or a bunch of drops. It if is tiny, just get that irontite ceramic sealer or the all irontite all weather seal(easier to use, compatible with coolant) and try that before anything else. JB is good but this needs to seal from the inside out and jb cant get in there like an internal sealant. 20 bucks or less bro, give it a try.
When we first discovered the crack it was up on the lift. There was coolant around the heater. The heater was actually loose so we tightened it up and no more coolant loss. The crack is a hairline.
Ive been checking coolant every morning and lost nothing in 5 days.
I cant say where you live if they would have it in stores but i am sure it is at most parts stores or truck stores. It is a cheap attempt at sealing things up permanent and it should work great for your issue. Best luck and report back!