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I've got this Coleman cooler n water dispenser which has been leaking by a very little amount... i still couldn't see the crack, but it's leaking... I'd prefer to buy a new one, but some of my friends advised to jus keep it anyway...cuz it can still hold water although leaking a bit..

So i wanna ask on how to repair it...

If I have found the crack, does anyone know how to seal it safely and strongly, yet will not poison the drink that I will put in the dispenser? (super glue? or what? and how exactly?)
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Food grade silicone sealant.