Quick Answer

Coating failure almost always starts with surface preparation. A two-car garage (about 40 m2) takes one day to prep: clean, patch cracks, abrade with a 30/46 metal-bond disc on a push grinder, industrial vacuum, and apply epoxy resin the same evening. The goal is a CSP 3 profile—uniformly scratched, no glossy patches.

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Step by Step

What causes it.

See the tooling range in our concrete abrading discs category.

• Apply epoxy resin the same day. Wait 24 hours if the floor is cold.
• Edge abrade first with a 5-inch cup wheel. Then the big grinder does the middle.
• Second pass at 120 grit stage to strip the heavy scratch marks.
• Clean the floor. Degrease oil spots; they prevent bonding strength.
• Patch cracks and spalls with epoxy resin mortar. Let cure 24 hours.
• Industrial vacuum twice. Wipe with a damp microfiber cloth to catch fine dust.
• Abrade with 30/46 grit stage metal-bonded matrix. Our double-S segment discs works on most push grinders.

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

What a Good Garage Prep Looks Like

The details that matter.

• Cracks filled and flush.
• No trowel marks (especially on troweled new slabs).
• Uniform gray, no glossy patches.
• No visible oil stains.

Most coating warranties start and end with the surface profile.

Frequent Mistakes

Key factors in coating work.

• Using too fine a disc. 120 grit stage is the ceiling for epoxy resin prep.
• Abrading only the middle and forgetting the edges. Epoxy resin peels at the walls first.
• Not vacuuming enough. Garage fine dust kills epoxy resin bonding strength.

This is the step that decides whether the coating lasts.

Frequently Asked Questions

Q: Is it necessary to need to grind a new garage slab?

A: In short, Yes. New slabs are in most cases troweled even and require a CSP 3 for epoxy resin.

Q: Can I acid etch instead?

A: The practical answer is, You can, but abrading is more uniform and avoids acid disposal.

Q: How exactly long after grinding can I park cars?

A: For most jobs, Wait 7 days for the epoxy resin to fully cure, even if it feels dry.

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Conclusion

Prepare the profile, remove every contaminant, and the coating bonds for years. Patch, 30/46 abrade, 120 follow-up, industrial vacuum, and coat the same day.