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Adheseal PU-25FC: A Product Overview
Adheseal PU-25FC is the high-performance, single-component polyurethane sealant developed for Australian trade professionals who need reliability and speed. It's a tough, durable, and flexible sealant that cures fast (FC) to get the job done, accommodating significant movement while providing exceptional adhesion to a massive range of construction materials.
This isn't just a gap filler; it's a adhesive and sealant for demanding applications. It delivers outstanding performance for everything from sealing precast panels and curtain walls to high-traffic pavement joints and window perimeters. Because it’s paintable and mould-resistant, you can deliver a clean, durable finish that protects your work and your reputation. When you need a versatile sealant that handles high movement and is certified for potable water (AS/NZS 4020), PU-25FC is the smart choice for zero doubt and no costly callbacks.
Core Features & Specifications
- High Movement Capability (ASTM C719): Accommodates joint movement of 25%, preventing cracking or tearing in expansion joints.
- Fast Curing (FC): Moisture-curing system skins in approximately 60 minutes and cures at 3mm per 24 hours, letting you move on to painting or handover faster.
- Paintable: Fully compatible with acrylic, oil, and rubber-based paints (once cured) for a seamless, concealed finish.
- Excellent Durability: Forms a tough, tear-resistant, and non-corrosive seal with good UV resistance for long-term external performance.
- Potable Water Certified: Tested in accordance with AS/NZS 4020, making it suitable for contact with drinking water.
- Low VOC: Non-toxic and low odour formulation meets Green Star environmental criteria.
The Adheseal PU-25FC Advantage
- Protect Your Margins: The fast-cure (FC) formulation and paintable finish reduce on-site labour time and streamline your workflow, protecting your profitability.
- Eliminate Callbacks: With ±25% movement capability and exceptional tear strength, PU-25FC provides a resilient, permanent seal that moves with the building, eliminating costly rework.
- Job-Site Ready Versatility: One product for a huge range of jobs—precast panels, window frames, metal cladding, pavements, and even below-waterline applications (once cured).
- Seal with Confidence: AS/NZS 4020 and AS1530.3 compliance provides the technical proof you need to stand behind your work with zero doubt.
Adheseal tips for using Adheseal PU-25FC
Scenario: 3-Sided Adhesion
Potential Outcome: The sealant adheres to the back of the joint, restricting its ability to stretch and leading to cohesive failure (tearing) and leaks.
Adheseal Best Practice: Always use an Adhefoam open cell backer rod (sized 25% larger than the joint) or a bond-breaker tape. This ensures the sealant only adheres to the two parallel sides, allowing it to achieve its full ±25% movement capability. This is non-negotiable for a first-time-right result.
Scenario: Poor Substrate Preparation
Potential Outcome: Adhesion failure and delamination, even weeks or months after application, resulting in a complete joint failure and costly callbacks.
Adheseal Best Practice: Surfaces must be sound, dry, and free of all contaminants. For critical applications, priming is essential. Use Everflex Supaprime for porous surfaces (concrete, brick) and Adheseal 50A Surface Prep for non-porous surfaces (aluminium, powder coat) to guarantee optimal, long-term adhesion.
Applications in Practice: Trade Scenarios
For Builders & Concreters: Sealing Expansion Joints
The Professional's Challenge
Sealing precast or tilt-up panel joints requires a sealant that can handle high structural movement (±25%) and weather exposure without failing.
The Adheseal Solution
PU-25FC is engineered for this exact task. After priming with Everflex Supaprime and installing backer rod, apply PU-25FC to deliver a joint that passes ASTM C719 testing. Its 6.5 N/mm tear strength ensures it resists failure, giving you a predictable, durable result. Success means a watertight building envelope and zero callbacks.
Best Practice Note
Ensure your joint width-to-depth ratio is 2:1 to allow the sealant to flex correctly. On porous concrete, priming is mandatory for long-term performance.
For Glaziers & Fabricators: Perimeter Window Sealing
The Professional's Challenge
You need a fast-curing, paintable sealant that adheres perfectly to powder-coated aluminium and common building substrates for a clean, weatherproof finish.
The Adheseal Solution
PU-25FC provides exceptional adhesion to metals and masonry. Prepare aluminium with Adheseal 50A Surface Prep for a locked-in bond. The fast cure time lets you finish the job sooner, and its paintable skin means it can be seamlessly integrated with the final building finish. Success means a spotless, leak-free installation and a happy client.
Best Practice Note
Always use the two-wipe process with a suitable solvent like Xylene on non-porous surfaces *before* priming to remove all residues.
Frequently Asked Questions
Is Adheseal PU-25FC suitable for contact with drinking water?
Yes, Adheseal PU-25FC is certified for potable water contact. It has been tested in accordance with AS/NZS 4020, making it a suitable choice for sealing joints in tanks, pipes, and other infrastructure that will contain drinking water. This gives you the compliance and peace of mind needed for critical water applications.
How soon can I paint over PU-25FC sealant?
You can paint PU-25FC once it is fully cured. The cure rate is approximately 3mm per 24 hours. While it skins in about 60 minutes, applying paint before it has cured through can interfere with the curing process. For best results, wait until the sealant is fully cured. It is compatible with acrylic, oil, and rubber-based paints, but always run a small test for adhesion first, as non-flexible paints may crack over a flexible joint.
What does ±25% movement capability mean for my job?
A ±25% movement capability means the sealant can safely stretch and compress up to 25% of the original joint width. This is critical for expansion joints, precast panels, and window perimeters where materials expand and contract with temperature changes. This high flexibility (tested to ASTM C719) is your assurance that the sealant will move with the building and not tear or delaminate, preventing leaks and callbacks.
Why is my polyurethane sealant bubbling (gassing)?
Bubbling is almost always caused by moisture or air. Polyurethane sealants cure by reacting with atmospheric moisture. If the substrate is damp or wet, or if moisture vapour is transmitting through the concrete, it can cause the sealant to "gas" and form bubbles. It can also be caused by entrapping air during application or by damaging the skin of a *closed-cell* backer rod. To prevent this, always ensure your substrate is dry (concrete cured 28 days) and use an Adhefoam open-cell backer rod, which allows air to escape.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Expansion joints in precast / tilt-up panels | High movement capability (±25%) prevents tearing. | Builders, Concreters, Remedial |
| Perimeter sealing of windows & curtain walls | Excellent adhesion to aluminium; paintable for a clean finish. | Glaziers, Façade Installers, Builders |
| Pavement joints, car parks, driveways | Tear-resistant and durable to withstand traffic. | Concreters, Landscapers |
| Metal cladding & bolted lap joints | Non-corrosive and weatherproof; fast curing. | Roofers, Plumbers, Shed Builders |
| Potable water applications (tanks, pipes) | Certified to AS/NZS 4020 for contact with drinking water. | Plumbers, Maintenance, Civil |
| General adhesive (skirting, acoustic panels) | Tough, flexible bond; replaces mechanical fixings. | Carpenters, Joiners, Fit-out |
| Vehicular and marine manufacturing | High-strength adhesive/sealant for seam sealing. | Manufacturers, Auto Body, Marine |
Applying Adheseal PU-25FC: Enhanced Protocols & Best Practices
-
Step 1: Joint Design & Preparation
Correct joint design is critical for performance. Ensure all surfaces are sound, clean, dry, and free of all contaminants. Concrete must be cured for 28 days.
Joint Dimensions
Maintain a 2:1 width-to-depth ratio. For external joints, minimum width should be 12mm. For internal, 5mm. Use masking tape for neat joint lines.
Backing Rod
Insert Adhefoam open cell backer rod, sized 25% larger than the joint width, to control the sealant depth and critically, to prevent 3-sided adhesion.
Pro Tip: Preventing 3-sided adhesion is the most important step for a flexible joint that will not fail. If the joint is too shallow for a rod, you must use a bond-breaker tape at the base. -
Step 2: Priming
For optimal, long-term adhesion and in all critical applications, priming is mandatory.
Porous Surfaces
Apply one coat of Everflex Supaprime to concrete, render, brick, or timber.
Non-Porous Surfaces
After cleaning and abrading, apply Adheseal 50A Surface Prep to aluminium, powder coat, or PVC.
Timing: Allow primer to become touch-dry (minimum 30 minutes, maximum 2 hours) before applying sealant. -
Step 3: Application & Tooling
Apply sealant at temperatures between +5°C and +35°C. Cut nozzle at a 45° angle to the desired bead size.
Application
Hold the gun at a 45° angle and push the sealant ahead of the nozzle. This ensures the sealant is forced firmly into the joint and prevents air entrapment, which can cause bubbles.
Tooling
Tool the sealant with a moistened spatula to create a smooth, concave finish. This ensures good contact with the joint sides for maximum adhesion.
Timing: Working time is approximately 25 minutes. You must tool the joint and remove any masking tape within this window, before the sealant skins.Pro Tip: For clean-up of uncured sealant, use Xylene. For skin, use Adheseal Hand Wipes. Cured sealant can only be removed mechanically.
Limitations & Safety
Product Limitations
Moisture Cure: Not suitable for totally confined spaces. Product requires atmospheric humidity to cure.
Chlorine Exposure: Not suitable for internal swimming pool applications or areas with high chlorine exposure (max 5ppm).
Substrate Incompatibility: Do not use on bituminous, natural rubber, or EPDM surfaces. May discolour copper and brass.
Specific Applications: Not intended for structural glazing (use Adheseal N-80) or adhering mirrors.
Natural Stone: Always conduct a stain test before using on any natural stone. Adheseal S100 is generally recommended for marble and granite.
Safety & Handling Requirements
Personal Protective Equipment
Wear suitable protective clothing, safety glasses, and chemical-resistant gloves (e.g., Nitrile Rubber).
Ventilation Requirements
Use only in well-ventilated areas. If inhalation risk exists (e.g., in confined spaces), wear an organic vapour/particulate respirator meeting AS/NZS 1715/1716.
Hazard Warnings
May cause an allergic skin reaction (H317). May cause allergy or asthma symptoms or breathing difficulties if inhaled (H334). Avoid breathing vapours.
Emergency First Aid
Eyes:
Rinse opened eye for several minutes under running water. Then consult a doctor.
Skin:
Immediately wash with water and soap and rinse thoroughly. If skin irritation or rash occurs, get medical advice.
Inhaled:
Remove victim to fresh air. If experiencing respiratory symptoms, call a POISON CENTRE or doctor.
Swallowed:
If swallowed, do not induce vomiting. Seek medical advice immediately.
Seek medical attention immediately in all cases of serious exposure.
Adheseal PU-25FC Adhesion & Preparation Guide
Porous Substrates (Concrete, Brick, Mortar, Timber)
Surface Preparation
Surfaces must be structurally sound, stable, dry, and 100% free of all dust, laitance, form release agents, and contaminants. Concrete must be allowed to cure for a minimum of 28 days.
Primer Requirements
Primer Required
For optimal adhesion and for all critical, high-stress, or water-immersion applications, priming is mandatory. Apply one coat of Everflex Supaprime by brush and allow to dry (30-120 minutes) before sealing.
Everflex SupaprimeNon-Porous Substrates (Aluminium, Powder Coat, PVC)
Surface Preparation
Slightly roughen the surface with a fine abrasive pad. Clean thoroughly using the two-wipe process with a clean, lint-free cloth and a solvent such as Xylene. Ensure surface is completely dry.
Primer Requirements
Primer Required
Pre-treat the cleaned surface with Adheseal 50A Surface Prep applied with a clean cloth. Allow to dry (30-120 minutes) before sealing to ensure a permanent, chemical bond.
Adheseal 50A Surface PrepProblematic Substrates (Copper, Brass, EPDM, Bitumen)
Surface Preparation
These substrates are generally not recommended for use with PU-25FC. The sealant may discolour copper and brass, and it will not adhere to bituminous or EPDM rubber surfaces.
Primer Requirements
Not Recommended
Do not use. Select an alternative sealant, such as a neutral cure silicone for copper/brass, after conducting an adhesion test.