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When you need to bond timber, boards, and metals structurally, quickly, and with D4 waterproof integrity, reaching for the right solution is critical. Adheseal Unobond FC is a single-pack, polyurethane adhesive formulated for demanding construction and marine applications. Packaged in a 6kg drum, it allows for efficient, high-coverage application, securing large areas with superior, invisible bonds.
Formulated to eliminate production inefficiencies and unreliable bonds in large-scale applications, Adheseal Unobond FC delivers superior, fast-setting, D4 waterproof, structural bonds across diverse materials. Its single-pack, solvent-free polyurethane chemistry cures rapidly with ambient moisture, providing robust adhesion without mixing. The 6kg drum format ensures efficient coverage for production-scale bonding, preventing project delays and rework.
Prepare surfaces to be structurally sound, dry, and clean, ensuring at least one surface contains moisture for optimal cure. For impervious metals, wipe clean with Xylene, then sand lightly to improve adhesion. Apply Unobond FC over one surface, spreading it evenly within the 15-minute working time. If conditions are dry or bonding non-porous materials, a light mist of water on the second surface aids curing. Bring components together immediately, clamping tightly for a minimum of 60 minutes. Maintain 50 PSI for softwoods or 150 PSI for hardwoods to ensure proper adhesive spread. Clean wet spills and tools with Xylene. Cured adhesive requires mechanical removal.
Adheseal Unobond FC is a structural adhesive designed for tight-fitting bond lines (0.1-0.25mm ideal, max 0.5mm) and efficient, high-coverage application from its 6kg drum. It is not designed for filling voids where bond strength would be compromised. For smaller, precise applications or jobs requiring a non-drip gel consistency, consider Unobond in a cartridge format, which offers the same D4 waterproof, structural bonding for spot applications.
Yes, Unobond FC is rated D4 for waterproof bonding. It withstands a 72-hour boiling water test, confirming its suitability for marine and demanding exterior applications where water exposure is constant.
Yes, consistent clamping or firm pressure is essential for maximum bond strength. Maintain pressure for at least 60 minutes at 23°C and 50% relative humidity, applying 50 PSI for softwoods and 150 PSI for hardwoods.
No, Unobond FC is an adhesive, not a primary gap filler. Using it as such reduces the structural strength of the bond. For gap filling, dedicated products like Adheseal GapFilla are more appropriate.
Apply Unobond FC at temperatures between 5°C and 35°C. Crucially, at least one of the bonding surfaces must have a moisture content of at least 8% for proper cure activation.
| Application | Key benefit | Primary trades |
|---|---|---|
| Structural timber bonding for exterior and marine environments | Achieves D4 waterproof rating, survives 72-hour boiling water test, resists low temperatures for durable performance. | Boat builders, exterior carpenters, joiners |
| Bonding diverse construction materials (metal, wood, concrete) | Develops 5 N/mm² tensile strength. Adheres to porous and non-porous substrates, non-corrosive to galvanised and zinc-coated steel. | General builders, fabricators, metalworkers |
| Installation of floor mouldings, skirting boards, and sub-flooring | Fast 1-2 hour setting time allows quick progression. Slight expansion fills minor substrate irregularities, contributing to a secure fix. | Finish carpenters, flooring installers |
| Manufacturing of furniture and cabinets | Delivers strong, resilient bonds with invisible glue lines in close-fitting joints. Low VOC content supports indoor air quality requirements. | Cabinet makers, furniture manufacturers |
Correct surface preparation is essential for structural bond strength and long-term durability.
Ensure substrates are structurally sound, stable and free from dust, loose or friable material, oils, grease, curing compounds and other contaminants. Allow new concrete to cure for at least 28 days before bonding and remove surface laitance by mechanical means if necessary.
Lightly abrade metals and dense surfaces, then use the two-wipe method with a suitable solvent such as xylene and fresh cloths. Replace cloths regularly to avoid spreading contamination back over the surface.
The liquid format of Unobond FC allows efficient coverage across large areas when spread correctly.
Open the drum and use appropriate dispensing equipment or a decanting process to apply adhesive onto one of the bonding surfaces. Keep the adhesive band approximately 10 mm in from external edges to minimise squeeze-out.
Use a spatula or suitable spreader to distribute Unobond FC evenly, targeting a glue line of approximately 0.1–0.25 mm (maximum 0.5 mm). Ensure complete coverage without pooling.
Firm, even pressure across the joint ensures structural performance and predictable results.
Bring the bonding surfaces together immediately after spreading and clamp tightly and evenly. Generate enough pressure to close joints and see some controlled squeeze-out along the edges.
Maintain clamping pressure for at least 60 minutes at 23°C and 50% RH with a pressing load of roughly 0.6 N/mm². Full cure is typically reached after about 24 hours, although low temperatures and humidity will slow the reaction.
Good cleanup and storage habits protect tools, maintain product quality and keep sites tidy.
Clean tools and fresh spills with xylene while the adhesive is still wet. Once cured, Unobond FC can only be removed mechanically by scraping or sanding.
Use appropriate hand wipes for skin cleaning and avoid solvent-based skin cleaners. After use, reseal the drum lid securely to limit exposure to air and store between 15°C and 25°C in a cool, dry place.
Warning: Hazardous chemical. Non-dangerous goods. Poison Schedule S5. Caution.
Wear overalls, gloves (Nitrile Rubber recommended for intermittent contact), safety glasses, and a respirator if inhalation risk exists. Use an organic vapour/particulate respirator meeting AS/NZS 1715 and AS/NZS 1716 standards.
Ensure adequate ventilation to maintain air concentrations below exposure standards. Use in well-ventilated areas, or with local exhaust ventilation.
Store in a cool, dry, well-ventilated place, out of direct sunlight and away from foodstuffs. Keep containers closed when not in use and check regularly for leaks. Dispose of contents and containers in accordance with local and national regulations.
Proper surface preparation and moisture management are critical for Unobond FC to achieve its full structural bond strength and D4 water resistance.
Surface prep: Ensure surfaces are structurally sound, dry, clean, and free of dust, oils, or grease. One bonding surface must contain a minimum of 8% moisture to activate curing.
Primer: Not required. The product uses substrate moisture for curing.
Surface prep: Surfaces must be structurally sound, dry, clean, and free of dust, oils, or form release agents. Concrete must be cured for at least 28 days to prevent adhesion issues. One bonding surface must contain a minimum of 8% moisture.
Primer: Not required. The product uses substrate moisture for curing.
Surface prep: Lightly sand metal surfaces to improve adhesion, then wipe with Adheseal Xylene solvent to remove contaminants. Ensure the mating substrate provides the necessary moisture for cure.
Primer: Not required, but Xylene cleaning is a necessary preparation step.
| Property | Value |
|---|---|
| Type of Product | Polyurethane Adhesive |
| Curing System | Moisture |
| Cure Time | 24 Hours |
| Density (Specific Gravity) | 1.085 ±0.02 g/cm³ |
| Pressing Time | 1 hour @ 0.6 N/mm² |
| Tensile Strength | 5 N/mm² |
| Tear Resistance | Up to 130 kg/cm² |
| Application Temperature | 5°C to 35°C |
| Service Temperature | -30°C to 100°C |
| Working Time | 15 minutes @ 23°C & 50% RH |
| Skinning Time | 10 minutes @ 23°C & 50% RH |
| Volatile By Volume | <1% |
| Shelf Life | 12 months in original packaging |
| Storage | Cool and Dry between 15°C and 25°C |
| Resistance | Insensitive to Frost, Sensitive to Humidity (cures product), Uninflammable |
| D Classification | D4 water-resistant bond |
| Colour | Blueish |
| Packaging Description | 6kg pail |
| Total VOC | <0.1% |
Here are some common examples on where Adheseal Unobond FC used by our customers.
Step-by-step application instructions for this product.
