Quick Answer: Remove epoxy from concrete with a grinder fitted with PCD tooling or a coarse metal-bond cup wheel, working dry with a HEPA-vacuumed shroud. Grind in overlapping passes until the coating is gone, then finish with a standard cup wheel to clean the profile for the next coating.

Why Epoxy Needs the Right Tool

Epoxy is tough and tends to smear and gum ordinary diamond wheels. PCD (polycrystalline diamond) tooling is specifically shaped to shave coatings without loading, so it is the fastest tool for full epoxy removal. A coarse metal-bond cup wheel works for thin or failing epoxy, but loads quickly on thick coatings.

For machines and hand grinders, the PCD tooling for epoxy removal keeps cutting when cup wheels clog.

Before You Grind

1. Peel or scrape any loose epoxy with a scraper to save tooling.
2. Check for delaminated sections; remove those before grinding the whole floor.
3. Mask doorways and vents; epoxy dust and chips spread far.

Epoxy removal is dusty and loud, so protect the rest of the building before you start.

Grinding Technique

Run the machine at normal speed and grind in straight, overlapping passes. Move steadily: dwelling in one spot melts the epoxy instead of cutting it. Check your progress frequently, because epoxy hides in low spots, along walls, and around patches. When you hit bare concrete everywhere, switch to a regular cup wheel and make one light pass to open the surface.

Do not grind wet. Water makes epoxy smear and pushes it into the pores; dry grinding with extraction is the standard method.

After Removal

Vacuum the dust, wipe the floor with a damp cloth, and look for glossy spots. Shiny patches mean epoxy residue is still in the pores, and the new coating will fail there. Regrind those areas, then check the floor profile against your coating's specification before recoating.

FAQ

What is the fastest way to remove epoxy from concrete?

PCD-equipped floor grinders remove epoxy fastest. Scrape the loose bulk first, then PCD shaves the rest without loading.

Can I remove epoxy with an angle grinder?

Yes, with PCD tooling or a coarse cup wheel on a 4.5- or 7-inch grinder. It is slower than a walk-behind but works in tight areas.

Do I need to remove all the epoxy before recoating?

Yes. New epoxy needs a clean, porous concrete profile; any residue will delaminate under the new coating.

Conclusion

Scrape the bulk, grind with PCD or coarse tooling dry in overlapping passes, and finish with a clean-up pass. The right PCD cup wheel turns epoxy removal from a nightmare into a fast, coating-ready floor.