Should I Use Epoxy or Polyurethane for Floor Repairs?

Where epoxy is the right choice

Epoxy works best when a floor has cracks, chips or loose sections that need to be filled and stabilised. It bonds strongly to stone, cement and metal substrates, and lower-shrinkage formulas help the repair hold its shape after curing. A thixotropic epoxy mastic such as Magelstick Epoxy Mastic is designed for this kind of work, including vertical or uneven areas where a runny resin would sag.

• Best for: filling cracks, chips and small voids
• Key properties: strong adhesion, minimal shrinkage, gap-filling body
• Typical use: repair layer below the final coating

Where polyurethane is the better choice

Polyurethane is usually the better topcoat after the underlying repair has cured. It provides the final wearing surface, with good resistance to scuffs, foot traffic and light exposure. A two-component polyurethane coating such as Prolux PU Coating can protect the repaired floor where regular cleaning and sunlight would otherwise degrade an unprotected surface.

• Best for: final coat on UV-exposed or high-traffic floors
• Key properties: abrasion resistance, UV stability, durable wearing surface
• Typical use: protective top layer over an epoxy repair

When this matters: putting the layers together

On quartz floors, the practical sequence is usually to fill or bond with epoxy, allow it to cure, then apply a polyurethane wearing layer. This matters most in areas that receive direct sunlight or regular foot traffic, where a single epoxy finish alone may look good initially but wear faster than a dedicated PU topcoat.

For clear epoxy coating work on surfaces where a thinner, glossy finish is being restored, an odourless clear epoxy such as Icrystal Clear Epoxy Resin can be an alternative. However, it is not the same as a structural filler and should not replace the repair layer.