Quick Answer

Coatings only bond as well as the surface they sit on. For a typical warehouse recoat over 2–3 mm old epoxy resin, start with chip PCD at low rotations per minute, then finish with level PCD or a 30/40 metal-bond disc to strip smear. Tooling such as WerkMaster PCD epoxy resin Tooling (JOY-WM-PCD1S1) is a proven chip-style PCD for WerkMaster and compatible planetary grinders; WerkMaster PCD Tooling (JOY-WM-PCD1R1) is the flatter bar used for residue and thin coating layers.

For machine-matched tooling, browse our WerkMaster PCD Tooling for Coating Removal range.

What PCD Actually Is

The details that matter.

Unlike metal-bond diamond segments, PCD does not rely on bond wear to expose new diamonds—the diamond layer is enormous and sharp, so it shears through soft coating layers like a blade.

Most coating warranties start and end with the surface profile.

About Flat PCD Bar vs Chip PCD

Key factors in coating work.

This is the step that decides whether the coating lasts.

Why Chip PCD Wins on Thick Epoxy

What causes it.

On 2 mm self-leveling epoxy resin, crews using chip PCD typically cover 60–120 m²/hour; level PCD on the same coating layer frequently drops to 20–40 m²/hour before loading.

• Maintains a consistent cut even as the epoxy resin softens.
• Keeps heat away from the PCD face.
• Creates a chip that peels off in ribbons instead of smearing.
• Cracks and curls the coating layer ahead of the diamond layer.

Getting prep wrong here shows up later as peeling or delamination.

When Flat PCD Is Better

The details that matter.

• The coating layer is under 0.5 mm thin film or curing compound.
• You require to clean up smear left by chip PCD.
• You are stripping glue, mastic or sealing layer residue after a first abrade.
• The concrete beneath is soft or burnished and you want a milder profile.
• Working on edges with a PCD cup wheel where chip geometry is impractical.

Most coating warranties start and end with the surface profile.

About Recommended Workflow for Thick Epoxy

Key factors in coating work.

• Assess a corner. Scrape with a putty knife to measure thickness and inspect for multiple coats.
• Light passes. Let the tool bite; do not push down. Take 0.2–0.5 mm per pass.
• Mount chip PCD. Use 3 or 6 chips per head at low–mid rotations per minute (600–900). Too fast melts the epoxy resin.
• Collect ribbons. Peeled epoxy resin wraps around the drum; sweep or industrial vacuum between passes.
• Switch to level PCD or 30/40 metal-bond. Strip the thin smear left behind. A disc like WerkMaster Single S Segment (JOY-WMS-S1) opens the concrete to CSP 2–3.
• Fine dust control. HEPA industrial vacuum with pre-separator; epoxy resin fine dust is an irritant.

This is the step that decides whether the coating lasts.

Problems And Fixes: Common Cases

What causes it.

• Coating layer curls but does not break: chips are worn. Replace PCD inserts; they wear faster than metal-bond diamonds on thick material.
• Concrete is gouged: chip PCD is aggressive. Reduce downward pressure; let equipment weight work.
• PCD loads up: rotations per minute too high or coating layer too thick for the bar. Slow down, switch to chip PCD, or take lighter passes.
• Uneven finish: tooling not evenly spaced or wear bars out of adjustment. Inspect shoe springs.

Getting prep wrong here shows up later as peeling or delamination.

Frequently Asked Questions

Q: Is chip PCD better than full PCD for 2 mm epoxy?

A: The practical answer is, Yes. At 2 mm and above, chip-style PCD peels the coating layer in ribbons and resists loading far more suitable than a level PCD bar. Reserve level PCD for residue and films under 1 mm.

Q: How exactly long does chip PCD last?

A: For most jobs, On 2 mm epoxy resin, expect 300–800 m² per set of 3 shoes, depending on coating layer hardness and concrete abrasiveness. Concrete below the coating layer wears the tungsten chips over time.

Q: Am I able to use PCD on a handheld angle grinder?

A: In short, Yes, with a PCD cup wheel. It is slower than a planetary grinder but works for edges, stairs and patches. For open floors, a walk-behind grinder with WerkMaster PCD epoxy resin Tooling (JOY-WM-PCD1S1) outproduces hand work many times over.

Q: Do I still need to grind after PCD?

A: The practical answer is, Yes. PCD leaves a smear and a light scratch mark. Follow with a 30/40 or 6/16 grit stage metal-bond disc to open the concrete to the CSP profile your new coating layer requires.

Looking for the right tool? Check our WerkMaster PCD Tooling for Epoxy Floor Removing. Looking for the right tool? Check our Husqvarna Piranha PCD Tool for Concrete Floor Coatin....

Conclusion

Do the prep thoroughly and the coating system performs as designed. Build your workflow around WerkMaster PCD epoxy resin Tooling (JOY-WM-PCD1S1) for the first pass and WerkMaster PCD Tooling (JOY-WM-PCD1R1) or WerkMaster Single S Segment (JOY-WMS-S1) for the second, and you will strip 2 mm epoxy resin faster and cleaner than crews still relying on level PCD bars.