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Unobond: Structural Polyurethane Adhesive
Unobond is a structural-grade, single-pack, moisture-curing polyurethane adhesive. Once cured, bonds are deemed structural and achieve D4 water resistance—making it suitable even for marine and exterior applications.
Its fast setting nature and ability to bond both porous and non-porous substrates deliver versatility on site and in workshop production. Unobond resists mould, humidity and low temperatures, cures rapidly under pressure, and remains durable and resilient long-term.
Its fast setting nature and ability to bond both porous and non-porous substrates deliver versatility on site and in workshop production. Unobond resists mould, humidity and low temperatures, cures rapidly under pressure, and remains durable and resilient long-term.
Core Features & Specifications
- Single pack, no mixing required; moisture curing polyurethane adhesive.
- Structural bond strength with D4 classification (water resistant).
- Bonds porous → porous and porous → non-porous substrates.
- Fast set, fast cure (24 h @ 23°C, 50% RH); skin time ~10 min; working time ~15 min.
- Superior adhesion to wood, concrete, metals, plastics, foams, veneers, composites.
- Paintable with acrylic, oil, and rubber-based paints (test recommended).
- Durable, weather resistant, non-corrosive, low odour, low VOC.
- Inhibits mould & biological growth in humid environments.
The Unobond Advantage
- Structural bond performance without multi-part mixing—saves time and cost.
- Moisture-curing means it expands slightly, filling small irregularities in joints.
- Resilient in hot, humid, or marine conditions where durability is critical.
- Versatile across construction, manufacturing, automotive, and marine industries.
Frequently Asked Questions
What materials can Unobond be used on?
Unobond is suitable for timber, concrete, masonry, brick, plasterboard, fibre cement, ceramics, and most metals. Always ensure surfaces are clean and dry before application.
Is Unobond suitable for outdoor use?
Yes, Unobond is weather-resistant and suitable for external use, provided it is not used in submerged or continuously wet areas.
How long does Unobond take to cure?
Unobond sets in 24–48 hours depending on substrate porosity, temperature, and humidity. Full cure is typically achieved within 7 days.
Can I paint over Unobond?
Yes, Unobond is paintable once fully cured. We recommend testing compatibility with your paint system before full application.
Do I need to use clamping or mechanical fasteners?
Unobond has high initial grab, but in heavy-duty or overhead applications, clamping or bracing is recommended until the adhesive sets.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Wall panel and skirting installation | Fast grab reduces need for bracing or fixings | Builders, Carpenters |
| Timber framing to concrete or masonry | Strong adhesion even on uneven substrates | Framing Contractors, Renovators |
| Stair tread or joinery installation | No mechanical fasteners needed; clean finish | Joiners, Cabinetmakers |
| Fixing decorative trims or cornices | Paintable, flexible, and low-shrinkage | Interior Fit-Out Teams, Painters |
| Bonding plasterboard to timber or steel studs | Gap-filling and fast drying improves speed | Plasterers, Drywall Installers |
| DIY home repairs and woodworking | Easy to apply with standard caulking gun | DIYers, Hobbyists |
How to Apply Unobond: Step-by-Step
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1. Prepare the Surface
Ensure surfaces are clean, dry, and free of grease, dust, or flaking particles. Lightly sand glossy or sealed substrates if needed.
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2. Cut and Load Cartridge
Cut the nozzle to the desired bead width and pierce the inner foil. Load into a standard caulking gun.
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3. Apply Adhesive
Apply Unobond in a zigzag pattern or in beads to one surface. Avoid applying too close to the edges to reduce squeeze-out.
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4. Join Surfaces
Press surfaces together firmly to spread the adhesive. If needed, clamp or brace for 24 hours until set.
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5. Clean Up
Wipe excess adhesive immediately with a dry cloth or solvent cleaner. Cured material must be removed mechanically.
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6. Allow to Cure
Allow 24–48 hours for Unobond to fully cure under normal conditions. Do not disturb bonded elements during this time.
Limitations & Safety
Product Limitations
Not suitable for use in permanently submerged applications (e.g. pools, tanks).
Avoid bonding polyethylene, polypropylene, or Teflon® without surface treatment.
Do not apply to wet, frozen, or contaminated surfaces.
Unobond is not a structural adhesive for critical load-bearing joints.
Safety & Handling Guidelines
Personal Protective Equipment
Wear gloves and eye protection during application. Avoid skin and eye contact.
Ventilation
Use in a well-ventilated area. Vapours may be flammable — avoid ignition sources.
Storage & Disposal
Store in a cool, dry place below 30°C. Dispose of contents and container in accordance with local regulations.
First Aid Measures
Eye Contact: Rinse thoroughly with water for 15 minutes. Seek medical attention.
Skin Contact: Wash with soap and water. Remove contaminated clothing.
Inhalation: Move to fresh air. Seek medical advice if symptoms persist.
Ingestion: Do not induce vomiting. Rinse mouth and seek medical attention immediately.
Always refer to the Unobond Safety Data Sheet (SDS) for full details.
Unobond Substrate Compatibility & Surface Preparation
Timber, Plywood, MDF
Surface Prep
Ensure surfaces are dry, dust-free, and free of oils or coatings. Lightly sand glossy finishes.
Primer Not Required
Concrete, Masonry, Brick
Surface Prep
Remove loose particles, dust, or laitance. Use a stiff brush or compressed air to clean surfaces.
Primer Not Required
Metals (Galvanised, Aluminium, Mild Steel)
Surface Prep
Degrease with solvent wipe and abrade lightly to improve adhesion.
Primer Optional – Test for critical applications
Ceramics, Tiles & Fibre Cement
Surface Prep
Wipe clean to remove dust or contaminants. Ensure surfaces are dry and free from sealers or polish.
Primer Not Required
Plasterboard & Wall Linings
Surface Prep
Wipe with a dry cloth to remove dust. Avoid over-wet application.
Primer Not Required
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