Quick Answer

Remove epoxy with coarse metal bond or PCD tooling, grind at moderate speed to avoid loading, then step down the grits to clean the profile. Thin films grind off directly; thick epoxy needs PCD or a scarifier first.

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When Diamond Grinding Works

• Thin sealers and curing films: coarse metal bond disc directly
• Thick epoxy: PCD first, then grinding to clean up
• Flexible coatings: grinding loads quickly - use PCD or scarifier

Choosing the Disc

Start with a coarse grit (6# or 16#) metal bond or PCD plate. Cup wheels with coarse segments work on edges and small areas. Match the bond to the concrete so the disc keeps cutting instead of glazing on the coating residue.

Avoiding Loading

Epoxy melts and loads the disc when it gets hot. Run at moderate speed, take light passes, and let the tool cool between passes. Vacuum frequently so removed coating does not re-stick to the surface.

The Clean-Up Sequence

1. PCD pass for thick coating
2. 16#-30/40# metal pass to remove residue
3. 60/80# and finer to smooth the profile
4. Vacuum and inspect before recoat or polish

Frequently Asked Questions

Q: Will grinding damage the concrete under the epoxy?

A>Done correctly, no - you remove the coating and a thin surface layer, leaving a clean profile.

Q: How do I know when the epoxy is fully gone?

A>When water or light shows a uniform colour across the floor with no shiny patches.

Q: Can one machine do the whole job?

A>Yes - a floor grinder with PCD and metal bond tooling handles removal and profiling.

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Conclusion

Match the tool to the coating thickness, control the heat, and finish with a clean grinding sequence. The result is a profile ready for the next coating or polish.