Run your hand across your garage floor. If it comes back with a gray powder, your concrete is dusting — and it's one of the worst conditions for epoxy adhesion. Dusting concrete has poor surface strength, high porosity, and will absorb epoxy without bonding properly.
What Is Concrete Dusting?
Dusting occurs when the top layer of concrete is weak, either from improper finishing during the original pour (overworking the surface, troweling in bleed water) or from surface deterioration over time. The result is a layer of calcium carbonate, sand, and cement that has little compressive strength and crumbles under foot traffic. This weak layer prevents epoxy from reaching and bonding to the strong concrete beneath.
Why It Matters Before Epoxy
Epoxy bonds to concrete, not to dust. If the top 1/16" of your slab is loose and powdery, epoxy will grip that weak layer — which then separates from the slab underneath, taking the coating with it. The fix is mechanical: diamond grinding removes the soft layer and exposes the hard, dense concrete below, which has the CSP (concrete surface profile) needed for adhesion.
Our Process
- Hardness assessment — Schmidt hammer test and visual inspection
- Diamond grinding — remove the weak surface layer, typically 1/16" to 1/8"
- Profile verification — confirm CSP 2–3 for proper epoxy bond
- Concrete hardener (if needed) — sodium or lithium silicate densifier for very porous slabs
- Epoxy primer — penetrating primer saturates the pore structure
- Full epoxy system — body coat, broadcast, commercial topcoat
Our Floor Problem Services
We test surface strength before recommending any system.
Remove the weak layer and expose strong, dense concrete.
Silicate hardener for very porous or soft slabs.
Correctly bonded to the hard concrete beneath.
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Not sure what you're dealing with? We'll evaluate your floor and give you a written quote. No obligation.
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