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Primer 2001: Polyurethane Primer for Porous Substrates
Primer 2001 is a moisture-curing, single-component polyurethane primer designed to improve adhesion of sealants and adhesives to porous surfaces. It rapidly penetrates and seals substrates such as concrete, timber, compressed fibre cement sheeting, and masonry, forming a tacky bonding interface ideal for Adheseal's PU and Hi-Flex MS products. Suitable for interior and exterior use, Primer 2001 helps prevent delamination and promotes long-term performance in high-moisture or high-movement joints.
Key Features & Specifications
- One-part, moisture-cure polyurethane – no mixing required
- Fast drying – typically ready to overcoat within 20–30 minutes
- Improves bond strength on porous and absorbent surfaces
- Ideal for use with PU and MS hybrid adhesives and sealants
- Resistant to mould growth in warm and humid environments
- Easy application via brush, roller, or spray
Why Choose Primer 2001?
- Prevents absorption of adhesives/sealants into porous surfaces
- Strengthens adhesive bonds for long-term joint performance
- Compatible with high-humidity applications and Australian climates
- Great for use prior to applying Adheseal’s sealants to expansion joints, facade panels, concrete slabs, and more
Best Practices: Do's & Don'ts
Do
- Ensure surface is clean, dry, and porous before applying
- Apply in thin, even coat using brush or roller
- Allow to become tacky (not fully dry) before applying sealant
- Store tightly sealed and use within shelf life
Don't
- Don’t apply to wet, contaminated, or sealed (non-porous) surfaces
- Don’t over-apply – excess primer may reduce adhesion
- Don’t leave exposed – always apply sealant within recoat window
Trade Use Cases: Applied in the Field
Waterproofer: Expansion Joint on Concrete Slab
The Problem
PU sealant is failing to adhere properly to exposed concrete edge of expansion joint in car park deck.
The Solution
Prime porous joint edge with Primer 2001 to seal dust and enhance sealant bond.
Best Practice
Apply Primer 2001 in a thin, continuous coat and wait 20–30 minutes before applying sealant while still tacky.
Facade Installer: Cladding to Timber Batten
The Problem
Sealant adhesion between cladding and timber substrate is inconsistent.
The Solution
Apply Primer 2001 to raw timber to stabilise surface and boost PU sealant grip.
Best Practice
Ensure timber is dry and sanded. Use a clean brush and avoid pooling.
Frequently Asked Questions
What type of surfaces is Primer 2001 suitable for?
Primer 2001 is designed for porous substrates such as concrete, timber, compressed fibre cement sheeting, and masonry. It enhances adhesion when using polyurethane and MS sealants or adhesives.
How long should I wait before applying sealant over Primer 2001?
Allow 20–30 minutes for Primer 2001 to become tacky before applying sealant. Always apply the sealant within the recommended recoat window (typically within 4 hours).
Can I use Primer 2001 on sealed or non-porous surfaces?
No. Primer 2001 is designed specifically for porous surfaces. Non-porous substrates may require a different adhesion promoter or mechanical preparation.
Is Primer 2001 suitable for exterior applications?
Yes. Primer 2001 can be used both indoors and outdoors. Ensure application is done during dry weather conditions and that surfaces are clean and dry.
How should I clean tools after using Primer 2001?
Clean tools immediately with a suitable solvent (e.g., xylene or methylated spirits) before the primer cures. Once cured, mechanical cleaning is required.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Priming concrete or masonry joints | Improves sealant adhesion and prevents bond failure in high-moisture conditions | Waterproofers, Joint Sealers, General Builders |
| Prepping compressed fibre cement sheeting | Seals the porous surface and ensures reliable bonding with PU/MS sealants | Facade Installers, Cladding Contractors |
| Stabilising timber substrates | Reduces absorption and enhances grip of adhesives/sealants | Carpenters, Window/Door Installers, Joiners |
| Expansion joints in concrete slabs | Increases adhesion performance and durability of PU joint sealants | Commercial Construction Teams, Civil Contractors |
| Facade or window frame sealing | Ensures clean bond line and strong adhesion between frame and structure | Glaziers, Shopfitters, Building Envelope Specialists |
Applying Primer 2001: Step-by-Step Instructions
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1. Prepare the Substrate
Ensure all surfaces are clean, dry, and porous. Remove dust, grease, loose particles, and contaminants using abrasion or pressure washing if necessary.
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2. Stir the Primer
Gently stir Primer 2001 before use to ensure uniform consistency. Do not shake or whip air into the material.
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3. Apply Primer
Apply a thin, even coat using a clean brush, roller, or low-pressure spray. Avoid puddling or over-application.
Tip: One coat is generally sufficient for most porous surfaces. -
4. Wait Until Tacky
Allow primer to dry until it becomes tacky to the touch (usually 20–30 minutes depending on temperature and humidity).
Do not apply sealant after full cure or beyond recoat window. -
5. Apply Sealant or Adhesive
While the surface remains tacky, apply your Adheseal polyurethane or MS sealant for maximum bond strength.
Limitations & Safety
Product Limitations
Not suitable for use on non-porous, glossy, or sealed surfaces without abrasion.
Do not over-apply — excessive primer may interfere with sealant adhesion.
Must be overcoated within recoat window. Re-priming may be necessary after 4 hours.
Do not apply during rain or if surface is wet or humid beyond safe working limits.
Safety & Handling Requirements
Personal Protective Equipment
Wear solvent-resistant gloves, goggles, and appropriate workwear during application.
Ventilation
Ensure adequate ventilation. Use in open areas or ventilated spaces to avoid inhalation of vapours.
Storage & Handling
Keep container tightly sealed when not in use. Store in a cool, dry place between 5°C and 30°C. Flammable — keep away from open flames.
Emergency First Aid
Eyes:
Flush immediately with water for at least 15 minutes. Seek medical attention.
Skin:
Remove contaminated clothing. Wash skin thoroughly with soap and water.
Inhalation:
Move to fresh air. Seek medical help if breathing difficulty occurs.
Ingestion:
Rinse mouth. Do not induce vomiting. Contact poison control or doctor immediately.
Refer to the Safety Data Sheet (SDS) for full health and handling information.
Primer 2001 Application Guide
Concrete (New or Old)
Surface Preparation
Ensure concrete is fully cured, clean, and dry. Remove dust, laitance, or contaminants by mechanical abrasion or pressure washing.
Primer 2001 required
Apply 1 coat by brush or roller to seal pores and improve sealant adhesion.
Timber (Bare, Exterior Grade)
Surface Preparation
Lightly sand and clean timber surface. Remove dust, oil, or coatings. Timber must be dry and porous.
Primer 2001 required
Use 1 coat to prevent sealant absorption and maximise bond strength.
Fibre Cement Sheeting
Surface Preparation
Surface must be dry, clean, and free of dust or loose fibres. Ensure boards are fixed according to manufacturer’s instructions.
Primer 2001 required
Prime before applying PU or MS sealants to ensure reliable bonding.
Masonry & Brickwork
Surface Preparation
Brush or air-blast to remove dust and debris. If surface is friable, consolidate or remove loose areas.
Primer 2001 required
Apply primer before using polyurethane sealants on porous masonry joints or panels.
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