Quick Answer

Coatings only bond as well as the surface they sit on. Stripping a thin acrylic sealing layer from concrete in most cases takes 1–2 abrading passes with metal-bond tooling at 30/40 grit stage. Thicker coating layers (epoxy resin, urethane, or multiple sealing layer layers) require PCD tooling first and 2–4 passes total.

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What Counts as a Light Coating

The details that matter.

When it resists scraping or is thicker than 0.5mm, treat it as a medium coating layer and start with PCD.

• Penetrating sealing layers that failed — surface sheen only, no film build.
• Acrylic sealing layer / curing compounds — thin film, 0.1–0.3mm, dries glossy.
• Light paint spatter or residual glue layer — patchy, not a continuous film.

Most coating warranties start and end with the surface profile.

About Pass Count by Coating Type

Key factors in coating work.

This is the step that decides whether the coating lasts.

Run The Passes: Step-by-Step

What causes it.

• Finish: if the floor will be coated again, stop at CSP 1–2. If it will be burnished, move to 80/100 grit stage.
• Industrial vacuum and inspect: glossy spots mean the film remains; dull, gray concrete means you are through.
• Use a planetary grinder or hand grinder with a dust shroud; industrial vacuum continuously.
• Pass 1: 30/40 grit stage metal-bond, overlapping 50%, moderate pressure. Stop if segments load up (sealing layer melting) — let the disc cool or switch to PCD.
• Pass 2: re-run the same tooling over remaining sheen, lighter pressure, faster travel.

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

Common Mistakes

The details that matter.

• Skipping inspection — most projects require a second pass over 10–30% of the area, not the whole floor.
• Forgetting to inspect segment wear — a worn plate stops sawing and just burnishes the sealing layer.
• Using fine grit stage first — 80/120 grit stage polishes the sealing layer instead of sawing it; start coarse.
• Too much pressure — melts acrylic into the segments, causing glazing and longer stripping times.

Most coating warranties start and end with the surface profile.

Frequently Asked Questions

Q: Is it possible to remove acrylic sealer with an angle grinder?

A: For most jobs, Yes, for small areas. Use a 5''/125mm cup wheel at 30/40 grit stage with a dust shroud. It takes 2–3 minutes per square meter, versus 30–60 seconds with a walk-behind grinder.

Q: For what reason does my sealer removal glaze the segments?

A: In short, Acrylic melts under heat and friction, coating layer the diamonds. Reduce pressure, increase pass speed, let the disc cool between passes, or switch to PCD tooling which shears rather than grinds.

Q: What grit removes a sealer fastest?

A: The practical answer is, A> 30/40 grit stage metal-bond cuts the fastest while leaving a CSP 1–2 profile. Finer grit stages burnish instead of strip and can smear the sealing layer across the floor.

Q: Should I need to grind after chemical stripping?

A: For most jobs, In most cases yes. Chemical strippers soften the sealing layer but leave residue and surface contamination. A single 30/40 pass cleans the floor and restores a proper profile.

Q: In what way do I know when the coating is fully gone?

A: In short, A> The surface should look uniformly gray with no glossy patches. Mist water on a small area — it should soak in rapidly rather than bead up. If it beads, more passes are needed.

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Conclusion

The surface profile is the whole game - fix it before the coating goes on. JOY TECH offers 30/40 metal-bond discs and PCD tooling for every coating layer scenario.