For sealing and bonding jobs on porous surfaces or metals, Sika Primer-3 N Epoxy Primer is the single-component, solvent-based primer required to prepare the substrate before applying Sikaflex, SikaHyflex, SikaBond, or Sikasil adhesives and sealants.
The primer functions as an adhesion promoter on porous substrates like concrete and on non-porous metals. This solvent-based epoxy resin compound is water-repellent and penetrates porous surfaces to establish a secure bonding path for the joint sealant. It is applied in a single pass with a clean brush or roller, drying quickly to minimise preparation downtime before sealing begins.
Substrates must be clean, dry, sound, and homogeneous. All oil, grease, dust, loose or friable particles, and cement laitance must be removed before application. Apply Sika Primer-3 N Epoxy Primer only once with a clean brush or roller. Tightly reseal the container immediately after each use. Clean all tools and application equipment immediately after use; once cured, the residual epoxy compound can only be removed mechanically.
Sika Primer-3 N is specifically designed to enhance adhesion for Sikaflex, SikaHyflex, SikaBond, and Sikasil products on porous substrates like concrete and various metals. It prepares the surface for a reliable bond.
No, Sika Primer-3 N is formulated for specific Sika sealants and adhesives only. Using it with non-Sika products or unapproved ranges may lead to compromised adhesion and performance failures.
The minimum flash-off time is 30 minutes, with a maximum of 8 hours. This window is critical for solvent evaporation before applying the sealant or adhesive, ensuring proper adhesion development.
Store Sika Primer-3 N in dry conditions, protected from direct sunlight, at temperatures between +5 °C and +25 °C. Once opened, use the product within one month and discard any gelled or separated material.
| Application | Key benefit | Primary trades |
|---|---|---|
| Prepping concrete for Sikaflex joint sealants | Ensures reliable, long-term adhesion on porous concrete surfaces, preventing common sealant failures. | Concrete placers, Commercial builders, Sealant applicators |
| Priming metal for SikaBond structural adhesives | Creates an optimal bonding surface on metals, enhancing the system's strength and durability. | Metal fabricators, Glaziers, Installers |
| Surface preparation for SikaHyflex facade sealants | Improves bond integrity on diverse construction substrates, contributing to weatherproofing performance and reducing callbacks. | Facade contractors, Waterproofers |
Danger: Highly flammable liquid and vapour. Causes serious eye irritation. May cause drowsiness or dizziness. Harmful to aquatic life with long lasting effects.
In cases of inadequate ventilation, wear respiratory protection with an organic vapour filter (Type A). Use chemical-resistant, impervious gloves, preferably Butyl rubber or nitrile rubber. Wear safety glasses for eye protection and protective cotton clothing for skin and body protection.
Ensure adequate ventilation during application. If ventilation is insufficient, wear appropriate respiratory protection. Avoid breathing vapours or spray mist.
Store in the original container in a cool, well-ventilated, locked-up place. Keep containers tightly closed and upright, protected from direct sunlight, at temperatures between +5 °C and +25 °C. Dispose of product waste through a licensed waste management company, ensuring it does not enter drains, water courses, or the soil. Contaminated packaging should be disposed of as unused product; do not re-use empty containers.
Proper substrate preparation and priming are essential for achieving durable adhesion with Sika sealants and adhesives. This guide outlines key requirements for compatible surfaces.
Surface prep: The surface must be clean, dry, sound, and homogeneous. Remove all oils, grease, dust, and loose or friable particles. Ensure cement laitance is fully removed.
Primer: Required. Apply a single, even coat using a clean brush or roller.
Surface prep: Ensure the metal surface is clean, dry, sound, and free from oils, grease, dust, and any loose material. Prepare the surface to achieve optimal adhesion.
Primer: Required. Apply a single, even coat with a clean brush or roller.
| Property | Value |
|---|---|
| Composition | 1-component, solvent-based epoxy resin compound |
| Colour | Transparent |
| Density | 1.00 kg/l (approx.) |
| Viscosity | 10 mPas (approx.) |
| Flash Point | -4 °C |
| Upper Explosion Limit | 7 % (V) |
| Lower Explosion Limit | 1 % (V) |
| Vapour Pressure | 99.9915 hPa |
| Auto-ignition Temperature | 425 °C |
| Dynamic Viscosity | 10 mPa.s (at 20 °C) |
| Kinematic Viscosity | < 20.5 mm2/s (at 40 °C) |
| Ambient Air Temperature | +5 °C to +40 °C |
| Substrate Temperature | +5 °C to +40 °C |
| Flash-off Time Minimum | 30 minutes |
| Flash-off Time Maximum | 8 hours |
| Yield per Litre on Porous Substrates | 5 m² |
| Linear Meters per Litre on Porous Substrates | 250 m |
| Yield per Litre on Non-Porous Substrates | 8 m² |
| Linear Meters per Litre on Non-Porous Substrates | 400 m |
| Shelf Life | 9 months |
| Storage Temperature | +5 °C to +25 °C |
| VOC Content | 66.6% w/w |
Here are some common examples on where Sika Primer-3 N Epoxy Primer used by our customers.
