There are lots of different types of epoxy resins out there. You would have to look at the MSDS, manufacturer recommendations and if it's food safe.
Also consider how you are trying to use it...would silicone, or another adhesive, work instead.
What are you trying to do?
Hey guys - has anyone had any luck with waterweld inside a cooler mashtun?
Anyone ruin a beer or get sick from it?
I've had exactly the opposite - an utter failure with JB waterweld (which IS food safe). It simply flaked up after a couple uses on the high-stress opening of a cooler. It simply does not adhere much (if at all) to HDPE - as is the case for most fixes.
After much research, I came across what I considered to be probably the most effective and longterm fix. It was "welding" in some HDPE into the cracks inside the cooler. I was almost about to try it until I decided, "screw it", and bought a new cooler for ~$20.
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