Adhesion failure on concrete or metal can derail a project. Sika Primer-3 N ensures a reliable bond for your Sikaflex, SikaHyflex, SikaBond, and Sikasil sealants and adhesives on these challenging substrates. Its transparent, solvent-based epoxy formulation provides a critical short flash-off time. This means faster progress without compromising long-term adhesion for porous surfaces and metal.

Why this product exists

Sika Primer-3 N is engineered to bridge the gap between demanding substrates and high-performance Sika sealants and adhesives. It promotes adhesion on porous materials like concrete and non-porous metals, preventing the common regret of poor or delayed bond development. Its 1-component, solvent-based epoxy resin composition is specifically designed for these pairings, offering a quick flash-off to maintain project schedules without sacrificing bond integrity.

The numbers that matter

The minimum 30-minute flash-off time allows for rapid follow-up with your Sika sealant or adhesive, ensuring efficient workflow on site. This speed is critical for maintaining project timelines without compromising the bond. With a yield of up to 8 m² per litre on non-porous substrates, Sika Primer-3 N offers efficient coverage. This translates to fewer containers and reduced material costs across larger projects.

What it's like to use

Sika Primer-3 N applies easily with a clean brush or roller. Only a single coat is required to achieve effective adhesion promotion. After application, observe the minimum 30-minute flash-off period before proceeding with your chosen Sika sealant or adhesive. It is critical to reseal the container immediately after each use. Any primer that has gelled or separated must be discarded, and opened containers must be used within one month for optimal performance.

Where this product excels

  • Civil Construction & Masonry: For perimeter sealing and expansion joints in concrete slabs, walls, or pre-cast elements where a reliable, long-lasting seal is paramount.
  • Glazing & Façade Work: Priming metal frames and concrete sills or mullions before applying facade sealants, ensuring a strong, weather-resistant bond in exposed conditions.
  • Roofing & Sheet Metal: Preparing metal flashing, roof penetrations, or panel joints for polyurethane or silicone sealants, protecting against water ingress and high winds.
  • General Building & Caulking: Wherever Sika sealants or adhesives are applied to concrete floors, walls, or metal components, ensuring optimal adhesion and preventing call-backs due to bond failure.

How it fits in a real system

Sika Primer-3 N serves as the crucial first step in any Sika sealing or bonding system where concrete or metal are present. It establishes the foundational bond between the substrate and the subsequent Sikaflex, SikaHyflex, SikaBond, or Sikasil product. This ensures the full performance capabilities of the sealant or adhesive are achieved, particularly in environments subject to movement, weather exposure, or high traffic. Its proper application following thorough substrate preparation directly contributes to the system's long-term durability and resistance to premature bond failure.

Choose this when

  • When applying Sikaflex, SikaHyflex, SikaBond, or Sikasil products to porous substrates like concrete.
  • When securing adhesion for Sika sealants and adhesives on metal surfaces.
  • When project schedules demand a short flash-off time to maintain workflow.
  • When requiring a transparent, water-repellent primer for Sika product systems.

Don't use this when

  • Not for: Substituting correct surface cleaning. Primers promote adhesion; they do not compensate for poorly prepared substrates.
  • Not for: Significantly improving surface strength. This primer is an adhesion promoter, not a surface consolidator.
  • Not for: Use beyond one month after opening the container, or if the product shows signs of gelling or separation. Its performance degrades over time once exposed to air.
  • Not for: Use with non-Sika branded sealants or adhesives unless specifically advised by the manufacturer of the sealant/adhesive.

For detailed information on safe handling, storage, and disposal, always refer to the most recent Safety Data Sheet (SDS). This document provides critical health and safety information for chemical products.