Should a Primer Be Used Before Applying Crack Repair Resin?

Why Priming Concrete Before Resin Application Is Important

Concrete surfaces, especially older or worn areas, often have dust, absorb moisture rapidly, or can be uneven. Applying a dedicated epoxy primer such as Epoxyprimer creates a sealed, stable layer. This promotes a strong bond between the substrate and your chosen repair resin, helping to prevent issues like peeling or poor adhesion over time.

Choosing and Using the Right Primer for Crack Repairs

Look for primers designed specifically for concrete, such as water-based epoxy formulas. These are compatible with many types of concrete and other surfaces, and emit minimal odours. Primer can be applied using a roller, brush, or spatula—ensure the substrate is clean, dry, and free from debris before use.

• Mix and apply according to manufacturer’s instructions
• Allow the primer to fully cure (usually 24–48 hours) before resin application
• Ensure all cracks and porous areas are thoroughly coated

When This Matters Most

Priming is especially crucial when working with worn, porous, or dusty concrete, or when repairing cracks in areas exposed to moisture or heavy loads. Skipping this step can risk weaker repairs and premature breakdown.