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5 minute will yellow and look like dried snots in no time , then it will crack up and flake off. 30 minute will survive longer but eventually will also turn snot yellow.
Just google rodbuilding supplies and almost all sell flex coat. If the hardener you have is still liquid but the resin part looks a little solid , like wax , you can just heat the resin up and it will liquify again. Even 5 year old flexcoat will be better than 5 or 30 minute epoxy. I would use polyurethane or varnish before using the epoxy.
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