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Bostik Seal 'N' Flex One P390
Bostik Seal 'N' Flex One P390

Bostik Seal 'N' Flex One P390

Flexible, paintable polyurethane sealant with ±50% joint movement, excellent durability, acoustic rating, and made in Australia for diverse substrates.
Vendor: Bostik
SKU: SNFFCBL/CTG/BOX
Availability: Out Of Stock
$305.20
$305.20
Prices do not include GST
Physical Properties
Chemical properties: Polyurethane
Colour: White, grey, black
Packaging options: 300ml cartridge 20 per box, 600ml sausage 20 per box
Specific gravity: 1.25 g/ml
Shore a hardness: 30
Tensile strength: >1.3 n/mm²
Elongation at break: >900%
Cure rate: 2mm per 24 hours on porous substrates
Full cure: 7 days (14 days for joints over 20mm)
Skin formation time: 6–12 hours
Application temperature: 5°c to 35°c (41°f to 95°f)
Service temperature: -40°c to 75°c (-40°f to 167°f)
Voc content: 74 g/l
Coverage rate: 5 linear meters per 600ml sausage (10 x 10mm joint)
Storage temperature: 5°c to 30°c (41°f to 86°f)
Shelf life: 12 months from date of manufacture
Standards compliance: As4020, astm c920-87 & 98 type s grade ns class 50, as 2253 / 1276 acoustic rated

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Shipping & Delivery

$15.95 + GST for Australia-wide shipping, excluding DG, oversized, long-length, and bagged items over 15kg. Rural, remote areas and site deliveries are also ineligible. If your order includes any of these, we will contact you to arrange additional freight fees. Online purchases only.

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Bostik Seal 'N' Flex One P390
Bostik
Bostik Seal 'N' Flex One P390
$305.20
Bostik Seal 'N' Flex One P390
Bostik Seal 'N' Flex One P390
Bostik
Bostik Seal 'N' Flex One P390
$305.20
Colours: Black
Size: 300ml Cartridge
Package Type: Box Buy (20)
Description  

Please note, this product is available for BOX BUY only.

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
Common Questions  

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.

Uses & Benefits  

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  

How to apply Bostik Seal 'N' Flex One P390:

  1. Clean and dry surfaces thoroughly, removing dust, oil, and contaminants
  2. Insert backing rod for proper joint geometry and sealant adhesion
  3. Apply primer if required – N49 for porous, N40 for non-porous substrates
  4. Apply sealant using cartridge or sausage gun; tool off to smooth finish
  5. Allow to cure for 7-14 days depending on joint size and conditions
Limitations and Safety Info  

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
Suitable Substrates  

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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