1. Suitable Substrates
- New or existing concrete floors.
- Well-adhered old epoxy coatings (after sanding).
- Cement screeds, terrazzo, or precast concrete (after assessment).
2. Cleaning the Surface
- Remove dust, grease, oils, waxes, laitance, and loose materials using:
- Mechanical grinding or shot blasting (preferred for best adhesion)
- Wire brushing, sanding, or scarifying for small areas.
- Degreasing with a suitable chemical cleaner (e.g., Multilac Degreaser)
- Ensure all contaminants are removed—epoxy does not adhere to dirty or oily surfaces.
3. Moisture Check
- Concrete must be fully cured (minimum 28 days) and dry.
- Ideal moisture content: < 5%.
- Use a moisture meter if possible.
- Avoid application if moisture is present below the surface. Epoxy can blister or delaminate.
4. Surface Profiling
- The surface must be roughened to allow mechanical bonding.
- Use diamond grinding or shot blasting to achieve a surface profile similar to 60–100 grit sandpaper.
- Vacuum all dust before proceeding.
5. Crack and Hole Repair
- Fill cracks, pitting, or damaged areas using:
- Multilac Epoxy Putty or
- Epoxy mortar (mix of epoxy resin + silica sand)
- Allow full curing and sand to level if needed.
6. Priming
- Apply Multilac Epoxy Primer (2-pack) to seal and prepare the surface.
- It improves adhesion and reduces porosity.
- Let the primer cure as per datasheet (typically 6–12 hours before overcoating).
7. Environmental Conditions
- Surface temp: Above 10°C.
- Air humidity: < 85%.
- Avoid application if condensation or rain is expected.