What is wrong with your old epoxy floor finish?
Peeling? Efflorescence? Oil Stains?
Whatever the problem is, the solution is based on it. 💁♀️
Is there epoxy currently sealing the floor or did epoxy get spilled on the floor? I'm not sure exactly what you are asking. Sorry. Would be glad to help.😃
You could sand it
Sam, Sentinel Pro makes various adhesive remover. But they're solvents, so it's indoor, you'll wanna avoid exposure, and most masks can only be effective for very short amount of time. Another idea, would be to use a power chisel to chip off mechanically to avoid solvents, but definitely use particulate mask and sealed goggles. It's best if you don't have to remove it.