A concrete overlay and an epoxy/polyaspartic floor can both make an old slab look new, but they do it differently. A cementitious overlay creates a new mineral-based wearing surface over sound concrete. A resinous floor creates a polymer film/system bonded to the prepared slab. Neither approach is a substitute for correcting active settlement or unsupported concrete.
The Basic Difference
| Cementitious overlay | Epoxy/polyaspartic system | |
|---|---|---|
| What forms the surface | Cement/hydraulic binder plus polymers/aggregates depending on product. | Polymer resin layers; may include decorative flake, quartz or aggregate. |
| Typical look | Concrete-like, broomed, troweled, textured or decorative cement finish. | Solid color, flake, quartz, metallic or clear resin appearance. |
| Typical thickness | Product-specific; can create a meaningful new cementitious wear layer. | Product/system-specific; often measured by wet/dry film or total mil build. |
| Movement | Moving cracks/joints can reflect through and must be treated correctly. | Rigid resin systems can also telegraph active slab movement. |
| Moisture/UV | Depends on overlay and any sealer/coating placed over it. | Depends heavily on primer/base/topcoat chemistry and slab moisture. |
A Published Overlay Example
ARDEX CD FINE is a polymer-modified cementitious concrete dressing intended to resurface worn/spalled concrete and create a new concrete-like finish. Its technical data requires structurally sound concrete, mechanical cleaning where needed, and honoring moving joints/cracks. That last requirement matters: an overlay can improve the wearing surface without curing slab movement.
Why the Choice Is Not Just Appearance
- Use condition: garage, driveway, pool deck and patio expose systems to different UV, water and tire conditions.
- Slab shape: an overlay may correct minor surface defects but should not be used to disguise unsupported settlement.
- Moisture: resinous systems may be especially sensitive to moisture vapor unless designed for it.
- Future repair: consider how local damage, cracks or later recoating will be repaired.
- Traction: the final texture/sealer/topcoat—not the category name—determines wet feel.
A Southwest Florida Market Example
Local advertising reflects this distinction. Unique Stone USA markets concrete overlays and epoxy flooring as separate services in Southwest Florida. That is the right way to think about the decision: they are different surface systems that may compete for the same homeowner project, not interchangeable names for the same process.