After seeing this on a car audio site I tried it and it works great. It works so much better than devices that attach to the top of the can. Would probably work on smaller cans as well. I had never seen it his anywhere before so I wanted to pass it on. Just a couple of strips of 2" tape forming a v on the can opening. I used it on a can of glue but I am sure it would work on epoxy and paint as well.
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