Achieving a reliable, long-lasting bond for sealants and adhesives on non-porous surfaces like metals, glass, or powder-coated finishes is critical. Without proper preparation, even the best sealant can fail prematurely. Adheseal 50A Primer ensures your sealants and adhesives achieve maximum adhesion and durability on these challenging substrates. Get the bond right, every time.

Why this product exists

Adheseal 50A Primer was formulated as an adhesive wipe specifically to address the challenge of bonding sealants and adhesives to smooth, traditionally difficult-to-bond non-porous surfaces. It enhances the adhesion of Polyurethane, MS, Silicone, and Acrylic sealants. This ensures superior performance and extends the long-term durability of your installations, particularly when maximum bond strength and longevity are critical. We designed 50A Primer to be a fast-drying, single-pack solution that integrates seamlessly into your workflow for optimum results.

The numbers that matter

  • 15-second dry time: This ultra-fast flash-off means you can apply your sealant almost immediately, significantly speeding up project completion and reducing the risk of airborne contamination before the sealant is applied.
  • +5°C to +40°C application temperature: Adheseal 50A Primer maintains its performance across a broad temperature range. This flexibility means fewer weather delays and consistent results whether you are working in cooler mornings or hot afternoons.
  • 12-month shelf life: Stored correctly between 10°C and 35°C, this primer remains effective for a full year. This ensures product usability and minimises waste, supporting project continuity without unexpected material replacement.

What it's like to use

Prepare surfaces by ensuring they are clean, dry, and free from contaminants. For optimal adhesion on extremely non-porous or powder-coated substrates, lightly abrade the surface and clean thoroughly with Adheseal IPA Cleaner. Then, wipe the area sparingly with Adheseal 50A Primer using a clean cloth. The primer dries very quickly; if it remains wet, it indicates over-application. Ensure the primer is fully dry before applying your sealant or adhesive. Clean tools and spills while wet with IPA cleaner or a suitable solvent.

Where this product excels

  • Movement joints in wet areas: For sealing around non-porous elements like shower screens, porcelain fixtures, or tiled surfaces in kitchens and laundries, 50A Primer ensures the sealant adheres securely, preventing water ingress and premature joint failure.
  • Fenestration: When installing windows, doors, and curtain walls, use 50A Primer on glass, painted frames, and powder-coated aluminium to achieve a robust, weather-tight seal that stands up to movement and environmental exposure.
  • Sign manufacturing and commercial fit-outs: Bond effectively to smooth plastic components, painted metals, or powder-coated frames where long-term durability is essential for aesthetic integrity and structural performance.
  • Caravan, marine, and automotive: Critical for demanding applications on gel coat, fibreglass, and various vehicle surfaces, this primer ensures sealants and adhesives maintain their bond despite vibration, temperature shifts, and moisture exposure.

How it fits in a real system

Adheseal 50A Primer is typically the first liquid applied in a non-porous joint sealant system, serving as the crucial adhesion promoter before the sealant. In applications such as movement joints or fire-rated sealant installations, after thorough surface cleaning, apply 50A Primer to all non-porous contact surfaces. This creates the optimal interface for subsequent sealant application, ensuring the system performs as designed. For optimal system performance with polyurethane sealants like Adheseal PU15, ensure 50A is dry before sealant application.

Choose this when

  • When bonding Polyurethane, MS, Silicone, or Acrylic sealants and adhesives to non-porous substrates.
  • When working with metals, glass, plastics, powder-coated finishes, or painted surfaces.
  • For critical applications requiring maximum bond strength and long-term durability, such as in marine, automotive, or industrial settings.
  • For preparing surfaces for joint sealants in wet areas, kitchens, laundries, or fenestration installations.

Don't use this when

  • Not for: Porous substrates. Adheseal Adheseal Primer 2001 is designed for porous surfaces like concrete and masonry.
  • Not for: Lead or copper metals, as these are incompatible with the primer.
  • Not if: The contents have become milky. This indicates water absorption and contamination, rendering the primer ineffective.
  • Not before dry: Exposing the primed surface to thermal, mechanical, or chemical influences before 50A Primer has completely dried.

Adheseal 50A vs. Adheseal 2001 Primer

Adheseal Primer 50A provides enhanced adhesion for sealants and adhesives on non-porous surfaces. For porous substrates like concrete, masonry, and fibrous cement, Adheseal Primer 2001 is recommended. To determine whether your substrate is porous, dispense a coin-sized puddle of water onto the surface; if it absorbs in under two minutes, the surface is porous. If the puddle remains, the surface is non-porous. Choose 50A for non-porous, and 2001 for porous.