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Adheseal PU-15: A Product Overview
When you're on the job, you need a sealant that works as hard as you do. Adheseal PU-15 is a high-performance, low modulus polyurethane sealant that gives you a tough, durable, and highly flexible seal, every time. Engineered as a single-pack, moisture-curing formula, it’s ready to go straight out of the sausage, saving you time and hassle on site. It’s built for movement and connection joints, especially on porous substrates, making it the go-to solution for professional window installation and perimeter sealing.
This isn't just another sealant. With exceptional adhesion and the ability to accommodate movement up to ±25% of the joint width, PU-15 prevents failures and costly callbacks. It cures to a permanently elastic, waterproof, and mould-resistant seal that stands up to the tough Australian climate. Easy to apply and tool, it delivers a clean, professional finish that's ready for painting, so you can move on to the next job with confidence.
±25%
Movement capability (ASTM C 719) to handle significant structural expansion and contraction without cracking or losing adhesion.
Core Features & Specifications
- Low Modulus Formula: Remains highly flexible with high elasticity, accommodating joint movement without placing stress on the substrate.
- Excellent Adhesion: Bonds tenaciously to most common building materials including concrete, timber, metal, aluminium, and powder-coated surfaces.
- Paintable Surface: Compatible with acrylic, oil, and rubber-based paints, allowing for seamless integration with surrounding finishes (test for compatibility recommended).
- Weatherproof & Durable: Offers good weathering and water resistance, creating a long-lasting, resilient seal for internal and external applications.
- Mould & Mildew Resistant: Formulated to resist fungal growth, making it ideal for use in hot and humid environments.
- Low VOC Content: Non-toxic, low odour formulation that meets "Green Star" environmental criteria for a safer work environment.
The Adheseal PU-15 Advantage
- Eliminate Callbacks: The ±25% movement capability means the seal holds firm through thermal cycles and building shifts, so you get the job done right the first time.
- Work More Efficiently: As a ready-to-use, single-pack product, there's no mixing required. It's easy to gun and tool, saving you valuable time on site.
- Versatility You Can Trust: One product handles a huge range of applications, from window perimeters and curtain walls to tilt-up panels and metal cladding, simplifying your inventory.
- Stand Behind Your Work: The proven long-term durability and non-corrosive properties ensure your work looks professional for years, building your reputation for quality.
Applications in Practice: Trade Scenarios
For Window Installers (Fenestration): Sealing Perimeter Joints
The Professional's Challenge
Sealing the perimeter of aluminium window frames against masonry requires a sealant that can handle the different thermal expansion rates of metal and concrete, preventing water ingress and air leaks over the long term.
The Adheseal Solution
Adheseal PU-15's low modulus and ±25% movement capability easily accommodates this differential movement. Apply a continuous bead into a clean, primed joint, ensuring good contact with both the powder-coated aluminium and the masonry. Its excellent adhesion creates a durable, weatherproof seal that won't fail.
Best Practice Note
For optimal adhesion on powder-coated frames, lightly abrade the surface and clean with Adheseal 50A Surface Prep. Use a backing rod to ensure the correct 2:1 width-to-depth ratio for the joint.
For Builders (Precast/Tilt-Up): Sealing Expansion Joints
The Professional's Challenge
Expansion joints in precast or tilt-up concrete panels are critical for structural integrity, but need a reliable seal to prevent water entry and damage. The sealant must be durable enough to withstand building movement and harsh weather exposure.
The Adheseal Solution
PU-15 is the ideal choice for these high-movement joints. Its high elasticity and tear resistance ensure it doesn't split or lose its bond as panels shift. After ensuring the concrete is cured and primed with Everflex Supaprime, apply PU-15 over a backing rod to form a robust, permanently flexible, and waterproof seal.
Best Practice Note
Ensure concrete is cured for at least 28 days before application. Use an open-cell backing rod 25% larger than the joint width to control sealant depth and prevent three-sided adhesion.
Frequently Asked Questions
Can I paint over Adheseal PU-15?
Yes, Adheseal PU-15 is paintable with most acrylic, oil, and rubber-based paints once fully cured. However, we always recommend conducting a preliminary test to ensure good adhesion and compatibility. Keep in mind that applying a non-flexible paint over a flexible sealant may lead to cracking of the paint film as the joint moves.
What is the maximum joint width PU-15 can handle?
For optimal performance, the joint design should follow a 2:1 width-to-depth ratio. The recommended maximum joint width is 25mm, which should have a corresponding depth of 12mm. For any joint deeper than 10mm, a backing rod is essential to control the sealant depth and prevent three-sided adhesion, which would restrict movement.
How long does PU-15 take to cure?
Adheseal PU-15 will form a skin in approximately 60 minutes at 23°C and 50% relative humidity. It cures at a rate of approximately 3mm per 24 hours. Please note that cure times can vary depending on temperature, humidity, and the porosity of the substrate. Lower temperatures or humidity will extend the curing time.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Perimeter sealing of windows & curtain walls | Accommodates differential movement between frame and structure, providing a long-lasting weatherproof seal. | Window Installers, Glaziers, Builders |
| Expansion joints in precast / tilt-up panels | High elasticity and tear resistance prevents joint failure from structural movement and thermal cycles. | Builders, Concreters, Remedial Contractors |
| Sealing metal cladding and bolted lap joints | Excellent adhesion to metals and non-corrosive properties ensure a durable, watertight seal. | Roofers, Plumbers, Fabricators |
| General construction sealant for gaps and cracks | Versatile adhesion to wood, concrete, and metal makes it a reliable all-rounder for various sealing tasks on site. | Carpenters, Builders, General Trades |
| Vehicular and marine manufacturing seam sealing | Tough, durable, and permanently flexible seal withstands vibration and environmental exposure. | Mechanical Engineers, Fabricators |
Applying Adheseal PU-15: Professional Protocol
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Joint Preparation & Priming
Proper preparation is critical for a long-lasting seal. Ensure the joint is correctly designed and the substrate is ready to accept the sealant.
Surface Cleaning
All surfaces must be structurally sound, stable, dry, and free of dust, oils, grease, and any other contaminants. Use the two-wipe process with Xylene on non-porous surfaces.
Joint Design & Backing Rod
Install an open-cell foam backing rod 25% larger than the joint width to control sealant depth and prevent three-sided adhesion. The ideal sealant depth should be half the joint width (2:1 ratio).
Pro Tip: To ensure clean lines, mask the edges of the joint with tape before you begin. Remove the tape immediately after tooling, while the sealant is still wet. -
Application & Tooling
Apply the sealant with a steady, consistent motion to ensure the joint is completely filled without entrapping air.
Applying the Sealant
Cut the nozzle at a 45° angle. Hold your sausage gun at a 45° angle and push the sealant ahead of the nozzle, ensuring it makes full contact with both sides of the joint.
Tooling Off
Immediately after application, tool the sealant with a moistened spatula or finishing tool to create a smooth, concave finish. This ensures good contact and a professional look.
Timing: You have approximately 60 minutes of skin time at 23°C. All tooling must be completed within this window for the best results.
Limitations & Safety
Product Limitations
Not suitable for long-term water immersion or for use inside swimming pools. Avoid exposure to high levels of chlorine (max 5ppm).
Do not apply in totally confined spaces, as the sealant requires atmospheric moisture to cure properly.
Not suitable for structural glazing applications. Use Adheseal N-80 or N-60 Glazing Silicone instead.
Not recommended for use on natural stone like marble or granite, as staining may occur. A stain test is mandatory before use on any stone. Use Adheseal S100 for stone applications.
Avoid use on bituminous surfaces, natural rubber, or EPDM, as leaching oils may interfere with adhesion and curing.
Safety & Handling Requirements
Personal Protective Equipment
Always wear protective gloves (Nitrile rubber recommended), safety glasses, and suitable work clothing. Avoid direct skin and eye contact.
Ventilation Requirements
Use only in well-ventilated areas. If inhalation risk exists due to poor ventilation, wear an organic vapour/particulate respirator meeting AS/NZS 1715 & 1716 standards.
Emergency First Aid
Eyes:
Rinse opened eye for several minutes under running water. Then consult a doctor.
Skin:
Product may cause an allergic skin reaction. Immediately wash with plenty of soap and water and rinse thoroughly. If irritation persists, seek medical advice.
Inhaled:
May cause allergy or asthma symptoms. Remove victim to fresh air. If breathing is difficult, consult a doctor.
Swallowed:
DO NOT induce vomiting. Seek medical advice immediately.
If poisoning occurs, contact a doctor or Poisons Information Centre (Phone Australia 131 126).
Substrate Preparation & Priming Guide
Porous Substrates (Concrete, Masonry, Brick)
Surface Preparation
Surfaces must be structurally sound, dry, and clean. Remove all dust, loose material, oils, and curing compounds. New concrete must be allowed to cure for a minimum of 28 days before application.
Primer Requirements
Primer required for optimal adhesion
For critical applications, high-stress joints, or extreme weather exposure, prime the surface by applying one coat of Everflex Supaprime with a brush. Allow primer to become touch-dry (30 mins to 2 hours) before applying sealant.
Everflex SupaprimeNon-Porous Substrates (Aluminium, Powder Coat, PVC)
Surface Preparation
Ensure surfaces are clean, dry, and free from any oils or grease. For best results, use a two-wipe process with a suitable solvent like Xylene. Lightly abrading the surface with a fine abrasive pad can improve the bond.
Primer Requirements
Primer recommended for critical applications
While PU-15 has excellent adhesion, priming is recommended for multi-story buildings or highly stressed joints. Pre-treat the cleaned surface with Adheseal 50A Surface Prep applied with a clean cloth. Allow 30 mins to 2 hours before applying sealant.
Adheseal 50A Surface Prep- Choosing a selection results in a full page refresh.