Quick Answer

PCD wins on speed for thick epoxy and high-build coatings; diamond grinding wins on finish and is better for thin films. The best result comes from using both: PCD to break the coating, then metal bond grinding to clean and smooth the concrete.

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What PCD Does Well

• Shears thick epoxy, polyurethane and high-build coatings quickly
• Removes cement levellers and toppings
• Leaves a rough, aggressive profile that is great for adhesion

What Diamond Grinding Does Well

• Removes thin films and sealers cleanly
• Smooths the profile after PCD
• Steps down through the grits into polishing

When Each Tool Fails

PCD is inefficient on flexible, rubbery coatings - the sheer just bounces off. Diamond grinding loads up quickly on thick epoxy, and a loaded disc stops cutting. Match the tool to the coating type and thickness.

The Winning Sequence

1. PCD pass: break the coating (1-2 passes)
2. Metal bond pass at 16# or 30/40#: remove residue and PCD marks
3. Step down the grit ladder to the finish you need

Frequently Asked Questions

Q: Does PCD damage the concrete?

A>It roughens it, not damages it. The metal bond pass after restores a smooth base.

Q: Can I remove epoxy with only a grinder?

A>Thin films yes; thick epoxy will load discs. Use PCD for anything over about 1 mm.

Q: How many PCD passes for a garage floor?

A>Usually 1-2, depending on coating thickness and age.

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Conclusion

Use PCD for speed on thick coatings, diamond grinding for the finish. Together they strip any floor clean and leave a profile ready for the next step.