CSP 2 vs CSP 3: a field guide to concrete surface profiles

Concrete Surface Profile (CSP) is a 1–10 scale that describes how rough prepared concrete is. Most coatings specify a target range, and hitting it is the single biggest factor in long-term adhesion.

Thin films: CSP 1–2

Sealers and thin water-based coatings bond well to a light profile. A fine diamond grind or even a good etch can get you there.

Build coats: CSP 2–3

100% solids epoxy and polyaspartic systems want a CSP 2–3. That means a proper diamond grind — acid etching rarely reaches it evenly and leaves residue behind.

Check your work

Compare the ground slab to a set of ICRI profile chips, and do a water-drop test: water should soak in within a minute or two across the whole floor.