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Adheseal PU15 Polyurethane Sealant: A Product Overview
Adheseal PU15 is a low modulus elastomeric polyurethane sealant developed for movement and connection joints where long-term flexibility, adhesion, and weather resistance matter. Designed for fenestration and general construction detailing, it delivers predictable performance on site—first-time-right with no costly callbacks.
With movement capability up to ±25% and elongation exceeding 600%, PU15 flexes with building movement instead of fighting it. Once cured, it forms a permanently elastic, waterproof, dustproof joint that stands up to Australian heat, humidity, and daily structural stress.
Easy to gun, easy to tool, and compatible with most common construction substrates, PU15 keeps work moving while protecting your finish and your reputation.
Key Features of Adheseal PU15
- ±25% movement capability: accommodates structural and thermal movement without joint failure.
- Low modulus polyurethane: stays flexible long-term instead of hardening and cracking.
- Elongation >600%: stretches under load and recovers, protecting joint integrity.
- Excellent adhesion to concrete, masonry, metals, timber, powder coat and membranes.
- Paintable after cure: compatible with acrylic, oil and rubber-based paints (flexible coatings recommended).
- Mould and mildew resistant: performs reliably in hot and humid environments.
- Low VOC, low odour: safer to use indoors and compliant with Green Star criteria.
- Weather and UV resistant: proven durability in exposed external joints.
The Adheseal PU15 Advantage
- Seal movement joints once and move on—PU15 flexes instead of failing.
- Cleaner application and tooling save labour time on site.
- Reliable adhesion across mixed substrates reduces risk and callbacks.
- Suitable for internal and external use, so one product covers more jobs.
- Backed by Adheseal technical support and pre-installation adhesion testing if required.
Adheseal tips for using PU15
Scenario: Applying to damp or uncured concrete
Potential Outcome: Bubbling, poor adhesion, or long-term delamination.
Adheseal Best Practice: Ensure substrates are dry and concrete has cured for at least 28 days before sealing. Dry surfaces deliver predictable performance.
Scenario: Incorrect joint depth or three-sided adhesion
Potential Outcome: Joint stress, tearing, and early failure.
Adheseal Best Practice: Maintain a 2:1 width-to-depth ratio and use backing rod to prevent three-sided adhesion—movement stays controlled and durable.
Applications in Practice: Trade Scenarios
For Glaziers & Window Installers: Perimeter Window Sealing
The Professional's Challenge
Window perimeters move with temperature and structural shifts, and rigid sealants lead to cracks and leaks.
The Adheseal Solution
PU15 accommodates ±25% movement while maintaining adhesion to frames and masonry, keeping joints sealed through seasonal movement. Success means clean handover and no warranty call-backs.
Best Practice Note
Prime porous substrates and tool within skin time for the cleanest finish.
For Builders & Facade Contractors: Expansion Joints
The Professional's Challenge
Expansion joints in precast and cladding systems need flexibility without sacrificing durability.
The Adheseal Solution
PU15’s low modulus formulation absorbs movement while maintaining a waterproof seal—built for exposed Australian conditions. Success means joints that last as long as the facade.
Best Practice Note
Use backing rod to control depth and ensure two-sided adhesion only.
Frequently Asked Questions
Is Adheseal PU15 suitable for external use?
Yes, Adheseal PU15 is suitable for internal and external applications, offering excellent weather, UV, and water resistance when correctly applied.
How much movement can PU15 accommodate?
Adheseal PU15 accommodates up to ±25% joint movement, making it ideal for expansion and connection joints exposed to thermal or structural movement.
Can PU15 be painted?
Yes. Once cured, PU15 can be painted with acrylic, oil, or rubber-based paints. Flexible coatings are recommended to avoid cracking.
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.