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Bostik Seal ‘N’ Flex One Plus P590: A Technical Overview
P590 is a low-modulus, moisture-curing polyurethane sealant designed for construction and façade joints. It cures bubble-free to a tough, flexible seal capable of cyclic movement of +100%/−50%, delivering reliable performance on concrete, precast/tilt-up, masonry, ACM/ETICS, fibre-cement, metals and natural stone. A non-sag thixotropic paste with easy tooling, it offers >1000% elongation, Shore A >25, and tensile strength around 1.2 N/mm². Typical skin time is ~90 minutes (23 °C/50% RH) with cure ~3 mm/24h on porous substrates; full cure ~7 days (allow ~14 days for joints >20 mm). Operating range approx. −30 °C to 80 °C. Paintable after full cure; field test recommended for coating compatibility.
>1000%
Elongation at Break for extreme joint movement
Core Features & Specifications
- Low modulus PU with +100%/−50% movement for high-movement façades and expansion joints.
- Bubble-free, non-sag cure for clean, predictable finishes and minimal rework.
- >1000% elongation, Shore A >25, tensile ~1.2 N/mm² for durable flexibility.
- Skin ~90 min; cure ~3 mm/24h (23 °C/50% RH, porous substrates).
- Service temperature approx. −30 °C to 80 °C; application 5–40 °C.
- Paintable after ~7 days (check coating compatibility on site).
- Compliance: ASTM C920/C1248, EN 15651-1 F-EXT-INT-CC 25LM, EMICODE EC1, SNJF F25E.
- Packaging: 300 ml cartridges & 600 ml sausages; multiple colours including Grey, White, Black, Limestone, Sandstone, Off-White, Epping Grey.
The Bostik Seal ‘N’ Flex One Plus P590 Advantage
- Handles extreme building movement without cracking—reduces call-backs and warranty risk.
- Non-sag, easy tooling bead—faster, neater installs and consistent finishes across elevations.
- Broad substrate compatibility—fewer primers in typical vertical porous applications.
- UV-resistant, exterior-ready—reliable façade performance in harsh Australian conditions.
- Proven standards—specifiable confidence for engineers and builders.
Proactive Troubleshooting
Scenario: Applying over damp or contaminated joints
Potential Outcome: Poor adhesion, blistering or premature failure leading to costly remediation.
Best Practice: Clean and dry substrates thoroughly; remove laitance, dust, oils and old sealant. Verify moisture and re-prep as required before gunning.
Scenario: Incorrect joint geometry without backing rod
Potential Outcome: Three-sided adhesion, cohesive stress and cracking under movement.
Best Practice: Install backing rod and tool to a concave profile. Observe width:depth rules (min 5×5 mm; for >10 mm width, depth = width/3 + 6 mm).
Applications in Practice: Trade Scenarios
For Builders (On-site Applicator): Precast panel expansion joints
The Professional's Challenge
Absorbing large seasonal movement in vertical joints without sag, voids or edge-staining—and keeping program moving.
The Adheseal Solution
Gun P590 over clean, dry precast with backing rod installed. Target 10–20 mm widths with correct depth profile; tool to a smooth concave finish. Non-sag paste enables crisp façades and predictable cure.
Best Practice Note
Prime only where required (critical/high-stress or immersed zones). Conduct site adhesion tests before commencing full elevation.
For Facade Installers (Business Owner/Operator): ACM & cladding interfaces
The Professional's Challenge
Maintaining clean sightlines on ACM/metal cladding while ensuring long-term elasticity and paint compatibility.
The Adheseal Solution
Use P590 for perimeter joints; for metals/plastics, prime with Bostik N40 where specified. Easy tooling delivers neat beads; UV durability suits exposed façades.
Best Practice Note
If painting, allow ~7 days cure and patch-test coating. Avoid solvent-rich enamels that may soften or craze over moving joints.
For Specifiers/Engineers (Specifier): Masonry control joints
The Professional's Challenge
Specifying a compliant, low-VOC sealant with documented movement capability and durability for exterior control joints.
The Adheseal Solution
P590 meets ASTM C920 and EN 15651-1 25LM with EMICODE EC1. Specify joint design to the stated width/depth ratios and service temperatures for robust movement accommodation.
Best Practice Note
Nominate priming only for critical exposures (immersion, high stress, highly porous). Include on-site adhesion verification in the spec.
Frequently Asked Questions
Can Bostik Seal 'N' Flex One Plus P590 be used for potable water applications?
Yes, Bostik Seal 'N' Flex One Plus P590 is tested and compliant with AS/NZS 4020:2018 standards for contact with potable water. This makes it suitable for sealing joints in structures that store drinking water, provided it is allowed to cure fully before immersion.
How long do I need to wait before painting over the sealant?
You should wait a minimum of 7 days before painting over Bostik Seal 'N' Flex One Plus P590. Using solvent-based or oil-based coatings earlier may cause the surface to become tacky or discolour; always conduct a small field test to ensure paint compatibility.
Is it really okay to apply this sealant to damp surfaces?
Yes, P590 is specifically formulated for damp or moist substrates. While you should remove standing water, the sealant will still bond effectively to damp concrete, preventing weather-related delays and ensuring the job stays on schedule.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Vertical Expansion Joints | Non-sag performance and extreme movement (+100%/-50%) | Builders, Bricklayers |
| Tilt-up / Precast Panels | High flexibility and bubble-free curing in sun-exposed areas | Commercial Builders |
| Potable Water Structures | AS/NZS 4020 compliance for drinking water safety | Civil Contractors, Plumbers |
| Damp Substrate Sealing | Eliminates downtime by bonding to moist concrete | General Contractors |
Applying Bostik Seal 'N' Flex One Plus P590: Enhanced Protocols & Best Practices
-
Joint Setup & Preparation
Ensure the joint design is correct (minimum 5mm depth). Insert a backing rod to control sealant depth and prevent three-point adhesion.
Pro Tip: Always prime after the installation of the backing rod to ensure maximum adhesion to the bond face. -
Sealant Extrusion
Apply sealant in a continuous operation using a caulking gun. Use enough pressure to ensure the joint is properly filled without air gaps.
Timing: Skin time is approximately 90 minutes; ensure tooling is completed within this window. -
Tooling and Finishing
Tool the surface with a spatula or trowel to achieve a smooth, concave shape. This ensures maximum contact with the joint interface.
Pro Tip: P590 is unaffected by tooling method, but maintaining firm pressure during the final pass helps prevent bond failure.
Limitations & Safety
Product Limitations
Not recommended for use in chlorinated water (swimming pools, spas) or constant salt water immersion.
Do not apply to bituminous substrates or soft plastics such as PE, PP, and PTFE.
Avoid glazing applications and joints subject to traffic unless specified for those conditions.
Safety & Handling Requirements
Personal Protective Equipment
Wear protective goggles, gloves, and protective clothing. Use barrier creams where skin contact is likely.
Emergency First Aid
Eyes:
Flood with water for 15 minutes and seek medical advice.
Skin:
Remove contaminated clothing and wash skin thoroughly.
Swallowed:
Do NOT induce vomiting. Give a glass of water and seek medical advice.
Bostik Seal 'N' Flex One Plus P590 Application Guide
Concrete, Brickwork, and Masonry
Surface Preparation
Surfaces must be clean and free of dust, oil, grease, and old sealants. Loose particles should be vacuum cleaned. While the sealant can be applied to damp surfaces, standing water must be removed.
Primer Requirements
No primer typically required for standard dry joints.
For critical, high-performance applications or porous substrates subject to immersion, use Bostik N49 Primer.
Bostik N49 PrimerMetals (Aluminium, Stainless Steel, Brass)
Surface Preparation
Degrease surfaces thoroughly. Check for protective coatings (wax or plastic) on composite panels, as these must be removed or tested for compatibility.
Primer Requirements
Primer recommended for non-porous metals.
Prime all metallic non-porous substrates using the two-cloth method with Bostik N40 Primer.
Bostik N40 PrimerDownload Bostik Seal ‘N’ Flex One Plus P590 Documents
| Document | Type | Download |
|---|---|---|
| Bostik Seal ‘N’ Flex One Plus P590 Technical Data Sheet | TDS | |
| Bostik Seal ‘N’ Flex One Plus P590 Safety Data Sheet | SDS |
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