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Use Bostik Seal 'N' Flex One P390 for: Sealing expansion joints in precast panels, brickwork, fibre cement, aluminium windows, and more
Bostik Seal 'N' Flex One P390 is a high-performance, Class-A, low modulus polyurethane sealant designed for professional trade use. This one-component, moisture-curing sealant offers outstanding flexibility with ±50% joint movement capability, making it ideal for a wide range of internal and external construction applications. With acoustic rating, excellent durability, and compatibility with common substrates, it’s a reliable choice for demanding Australian conditions. Its paintability and no-mix application ensure efficient use on site, while compliance with AS4020 and ASTM standards guarantees peace of mind for trade professionals.
Key Features of Bostik Seal 'N' Flex One P390
- ±50% joint movement for superior flexibility in dynamic joints
- One-component, moisture-curing formula with no mixing required
- Acoustic rated for sound-sensitive applications
- Paintable after full cure, ensuring seamless finishes
- Non-sag, smooth thixotropic paste for clean application
- Made in Australia and compliant with AS4020 for potable water
Technical Overview
- Chemical Properties: Polyurethane
- Application Temperature Range: 5°C to 35°C (41°F to 95°F)
- Service Temperature: -40°C to 75°C (-40°F to 167°F)
- Tack Free Time: 6–12 hours
- Full Cure: 7 days (allow 14 days for joints over 20mm)
- Shore A Hardness: 30
- Elongation at Break: >900%
- VOC Content: 74 g/L
Trade Professional Information
- Required Tools: Cartridge or sausage caulking gun, spatula/trowel for tooling
- Trade-Specific Tips: Use backing rod for correct sealant geometry; ensure surfaces are dry and clean for optimal adhesion
- Common Issues and Solutions: For porous surfaces or extreme conditions, use Bostik N49 Primer; use N40 Primer on non-porous substrates
Storage and Shelf Life
- Storage Requirements: Cool, dry area (5°C to 30°C), away from direct sunlight
- Shelf Life Information: 12 months in unopened container
- Temperature Considerations: Avoid storage in extremes; dispose of in accordance with local regulations
Certifications
- AS4020 Potable Water Compliant
- ASTM C920-87 & 98 Type S, Grade NS, Class 50
- AS 2253 / 1276 Acoustic Rated
Frequently Asked Questions About Bostik Seal 'N' Flex One P390
Q: How should I apply Bostik Seal 'N' Flex One P390 for best results?
A: Ensure surfaces are clean and dry. Use a caulking gun for application and tool the bead for smoothness. For porous substrates, consider priming with Bostik N49.
Q: How long does Bostik Seal 'N' Flex One P390 take to fully cure?
A: It cures at 2mm per 24 hours on porous substrates. Full cure typically takes 7 days, or 14 days for joints over 20mm wide.
Q: Is this sealant compatible with aluminium windows and panels?
A: Yes, but conduct a P.A.T.S. test before application. Bare aluminium typically requires no primer; coated panels may require Bostik N40 Primer.
Q: What should I do if the sealant fails to adhere properly?
A: Check for surface contamination. Use appropriate primer (N49 or N40) based on substrate. Reapply with proper surface prep and joint dimensions.
Q: Are there any safety considerations during use?
A: Yes. Wear PPE including gloves, eye protection, and a respirator in poorly ventilated areas. Avoid skin contact and inhalation of vapours.
Use Bostik Seal 'N' Flex One P390 for:
- Sealing expansion joints in precast and tilt-up panels
- Joint sealing in brickwork, blockwork, and fibre cement
- Perimeter sealing around aluminium windows and façade panels
- Acoustic sealing in interior partitions and drywall
Why Use Bostik Seal 'N' Flex One P390:
- High flexibility ensures performance in dynamic joints
- Paintable finish enables aesthetic integration in construction
- Reliable adhesion across multiple substrates with minimal priming
- Australian-made for compliance and performance in local conditions
How to apply Bostik Seal 'N' Flex One P390:
- Clean and dry surfaces thoroughly, removing dust, oil, and contaminants
- Insert backing rod for proper joint geometry and sealant adhesion
- Apply primer if required – N49 for porous, N40 for non-porous substrates
- Apply sealant using cartridge or sausage gun; tool off to smooth finish
- Allow to cure for 7-14 days depending on joint size and conditions
Bostik Seal 'N' Flex One P390 limitations:
- Not for use in chlorinated or salt water immersion (e.g., pools)
- Do not apply below 5°C or above 35°C ambient temperature
- Not suitable for glazing or joints under traffic loads
- White variant may yellow under prolonged UV exposure
- Do not use on bitumen-containing materials
Safety precautions when using Bostik Seal 'N' Flex One P390:
- Personal Protective Equipment: Gloves, eye/face protection, protective clothing
- Ventilation: Use in well-ventilated areas; wear respirator if necessary
- Handling: Avoid skin and eye contact; wash thoroughly after use
- Dispose of waste according to local environmental regulations
Bostik Seal 'N' Flex One P390 can be used on the following substrates:
- Insitu concrete and render – ensure surface is dry and clean
- Precast and tilt-up panels – priming may be required for maximum adhesion
- Brickwork and blockwork – no priming needed if clean and uncontaminated
- Plasterboard – avoid painted or contaminated surfaces
- Fibre cement sheet – ensure surface is properly prepared
- Aluminium – conduct P.A.T.S. test for coated panels
- Fibreglass and GRC – primer recommended for high-stress joints
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