11
Primer 50A: Adhesion Promoter for Difficult Surfaces
Primer 50A is a clear, alcohol-based surface treatment that significantly improves the bond strength of sealants and adhesives to non-porous substrates. Designed for surfaces like powder-coated metal, plastics, painted surfaces, glass, and fibreglass, it creates a micro-etched surface that allows maximum sealant grip. Primer 50A is ideal for preparing surfaces prior to the application of Adheseal’s range of polyurethane, MS, acrylic, or silicone products.
Key Features & Specifications
- Promotes adhesion to smooth, glossy, and non-porous surfaces
- Compatible with PU, MS, Silicone, and Acrylic sealants/adhesives
- Wipe-on application — no mixing or curing time
- Fast-drying and clear — no staining or visual residue
- Used across construction, automotive, marine, signage, and glazing industries
Why Choose Primer 50A?
- Critical for bonding to powder-coated aluminium and painted metals
- Prevents adhesive failure on plastic or glazed surfaces
- Recommended for structural and exposed sealing applications
- Evaporates cleanly within seconds — apply and seal immediately
Best Practices: Do's & Don'ts
Do
- Clean surface before application using a suitable degreaser
- Apply using a clean lint-free cloth or primer pad
- Allow to flash off (typically <1 min) before applying sealant
- Use only on non-porous surfaces
Don't
- Don’t use on absorbent substrates (e.g. concrete, timber)
- Don’t over-apply — one thin pass is sufficient
- Don’t allow primed surface to be contaminated before sealant application
Trade Use Cases: Applied in the Field
Sign Installer: Sealing on Powder-Coated Fascia
The Problem
Silicone sealant isn’t bonding well to powder-coated fascia around signage frame.
The Solution
Use Primer 50A to prepare the powder-coated metal before applying silicone, ensuring long-term adhesion.
Best Practice
Wipe with 50A and allow to flash off before sealing. Avoid re-contamination of surface.
Marine Fabricator: Gluing Plastic Trim to Fibreglass Hull
The Problem
PU adhesive fails to adhere to smooth marine-grade plastic components.
The Solution
Prime plastic and fibreglass contact areas with Primer 50A to boost adhesion.
Best Practice
Use 50A on both surfaces. Apply adhesive within minutes of priming.
Frequently Asked Questions
What type of surfaces is Primer 50A suitable for?
Primer 50A is specifically formulated for non-porous surfaces such as powder-coated aluminium, glass, plastics, fibreglass, and painted metal.
How do I apply Primer 50A?
Apply with a clean, lint-free cloth or primer pad. Wipe over the bonding area in one even stroke. Allow solvent to evaporate (usually within 1 minute) before applying the sealant or adhesive.
Can Primer 50A be used on porous substrates like concrete or timber?
No. Primer 50A is not suitable for absorbent surfaces. Use a polyurethane primer like Primer 2001 for porous substrates.
Is Primer 50A compatible with all sealants?
Yes. Primer 50A is compatible with polyurethane, MS polymer, silicone, and acrylic sealants and adhesives.
Does Primer 50A leave a visible residue?
No. Primer 50A is a clear alcohol-based solution that evaporates cleanly and does not stain most surfaces when applied correctly.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Bonding to powder-coated aluminium window frames | Improves sealant adhesion and prevents edge lift on glossy finishes | Glaziers, Window Installers, Sealant Applicators |
| Adhering to smooth plastic signage components | Creates micro-etched surface on plastics for reliable bonding | Signwriters, Fabricators, Automotive Fitters |
| Sealing around painted metal structures or balustrades | Ensures long-term bond on painted steel and aluminum | Builders, Metal Fabricators, Waterproofers |
| Fixing accessories to glass shower panels or splashbacks | Strengthens grip of adhesives on non-porous glass surfaces | Bathroom Renovators, Joiners, Interior Fitout Teams |
| Marine and automotive sealing on gel coat or fibreglass | Improves compatibility with PU and MS sealants for exposed installations | Marine Technicians, Vehicle Body Repairers |
Applying Primer 50A: Step-by-Step Instructions
-
1. Clean the Surface
Ensure the surface is dry and free from grease, oil, dust, and any contaminants. Use an appropriate cleaner or degreaser.
-
2. Soak the Application Cloth
Dampen a clean, lint-free cloth or primer pad with Primer 50A. Do not oversaturate.
-
3. Wipe Onto Substrate
Apply Primer 50A in a single uniform stroke across the bonding area. Avoid circular motion or double-application.
-
4. Allow to Flash Off
Let the primer dry for approximately 30 seconds to 2 minutes. The surface should appear dry and clear before proceeding.
-
5. Apply Sealant or Adhesive
Apply the selected Adheseal sealant or adhesive immediately after flash-off. Do not delay or allow contamination.
Limitations & Safety
Product Limitations
Not suitable for porous surfaces such as timber, concrete, or masonry.
Do not over-apply — one thin coat is sufficient to activate bonding surface.
Apply sealant shortly after priming; avoid delays to prevent surface contamination.
Do not use near ignition sources — highly flammable alcohol base.
Safety & Handling Requirements
Personal Protective Equipment
Wear chemical-resistant gloves, safety glasses, and appropriate PPE when applying Primer 50A.
Ventilation
Use in a well-ventilated area. Avoid inhaling vapours. Consider using a respirator in enclosed spaces.
Storage & Handling
Store tightly sealed in a cool, dry, and well-ventilated area. Keep away from heat, sparks, and flames.
Emergency First Aid
Eyes:
Flush with water for at least 15 minutes. Seek medical advice.
Skin:
Wash thoroughly with soap and water. Remove contaminated clothing.
Inhalation:
Move to fresh air. Seek medical attention if symptoms persist.
Ingestion:
Do not induce vomiting. Rinse mouth and contact poison control or a doctor immediately.
Refer to the Safety Data Sheet (SDS) for full safety and hazard information.
Primer 50A Application Guide
Powder-Coated Aluminium
Surface Preparation
Clean surface with solvent cleaner or degreaser to remove oils and dust.
Primer 50A required
Apply 50A using a clean cloth. Allow to flash off before applying sealant or adhesive.
Glass
Surface Preparation
Ensure surface is clean, dry, and free of fingerprints or silicones. Use alcohol-based glass cleaner or IPA.
Primer 50A required
Apply a thin coat using lint-free cloth. Allow to dry before bonding.
Painted Metal Surfaces
Surface Preparation
Degrease using solvent or alcohol-based cleaner. Check for adhesion compatibility on test patch.
Primer 50A recommended
Improves bond strength to painted metal where mechanical abrasion isn’t suitable.
Plastics (e.g. PVC, ABS)
Surface Preparation
Wipe surface with plastic-safe cleaner. Test adhesion on small area if unsure.
Primer 50A required
Essential for long-term bonding to smooth plastics with PU, MS, or silicone adhesives.
- Choosing a selection results in a full page refresh.