Has anyone had to repour their epoxy coat after they had been using the mill with coolant? My epoxy never seemed to get rock hard, can gouge with a fingernail. Today I was cleaning up and one of my corner drains came right out. Thinking of putting in a larger drain and repouring the epoxy coat. Thoughts?
you will have to scuff sand the epoxy with 100 grit so it grabs it. Might be worth it to just do a few heavy coats of Flex Seal or Rustoleum Oil based enamel.
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That suggests a bad mix - incorrect proportions of catalyst & epoxy. It will never harden.
The correct way to fix it is to chisel out the soft epoxy and replace it with a new pour mixed correctly.
People do halfway decent repairs of failed epoxy pours by sanding or grinding the surface and pouring a clean properly mixed layer on top but that can result in a higher surface than you want and you’ll always have the weak soft layer inside. That may not impact your use although I haven’t seen anyone reporting long term results here, the recommendation is typically to remove & re-pour.
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I agree with @jamesdhatch. Just bite the bullet and start removing it. Make sure you mix that stuff with a drill paint mixer. Mix it, then remix it. All the bubbles will come out with the heat gun. Also, ensure the color agent is compatible with the epoxy you use.
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Good job. Mix and mix again, agreed 
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Nice. Make sure you scrape down the sides of the bucket when you’re mixing.
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I have the same issue. I know I mixed it right, but was very cold the day I poured. I used heaters, but the epoxy never got rock hard. I was wondering if I just scraped off the surface would be good enough.