I had that happening to me a few times in the past (not necessary because of epoxy but other dosings). This is what I did, in order, until it recovered:
- set the skimmer level to minimum, then collected & dumped a couple cups of the watery foam that it produced.
- removed the cup and let skimmer run "idle". It produced some foam inside the sump, it didn't come out and eventually it recovered to normal levels. Probably the chemicals evaporated or precipitated.
- stopped the skimmer for the night or a few hours.