Hi Laurie. I'm Cindy. Begin by scraping as much as you can from the surface using a stiff metal or plastic scraper. Warm the epoxy to lower its viscosity. Clean the residue with acetone or alcohol. Don't forget to read warnings on containers, and provide proper ventilation.
Set epoxy won’t want to be removed without serious measures.
How thick is it?
What is under that layer of epoxy? Wood?
Hi Laurie: Here are a couple of sites that may help: