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Price Per Box: $9.27
Use Megaprene 40GG Polyurethane Sealant for: High-movement joints, UV-exposed areas, potable water sealing, marine & vehicle body applications
Megaprene 40GG is a high-performance, gun-grade polyurethane sealant that cures by atmospheric moisture to form a tough, elastic, and waterproof joint. Designed for structural movement joints, metal cladding, precast panels, and vehicular and marine manufacturing, it combines flexibility (±25%) with chemical and UV resistance, making it ideal for Australia’s extreme climates. Fully compliant with AS/NZS 4020, it is safe for potable water applications.
Primer Information: Most surfaces do not require priming. For high-stress or submerged joints, use Adheseal 50A for non-porous substrates (e.g., aluminium, powder coat) and Everflex Supaprime for porous surfaces (e.g., concrete, brick). Always perform an adhesion test.
Cure Time: Skins in 60 minutes and cures at 3mm per 24 hours at 25°C and 50% RH. Allow for atmospheric humidity. Avoid enclosed or damp environments that hinder curing.
Coverage Rate: A 600ml sausage yields approx. 6 linear metres at 10x10mm joint size. Coverage varies based on bead profile and application method.
Application Temperature Range: 5°C to 35°C (41°F to 95°F). Suitable for both southern cold winters and tropical north conditions. Avoid high surface moisture during application.
Chemical Properties: Made of moisture-curing polyurethane, it resists water, detergent solutions, diluted acids and alkalis, and intermittent fuel/oil spills—ideal for construction and automotive use.
Key Features of Megaprene 40GG Polyurethane Sealant
- Certified for potable water contact (AS/NZS 4020) — ideal for plumbing and tanks
- Excellent adhesion to concrete, timber, powder coat, and metal — no primer required for most jobs
- UV and weather-resistant — withstands long-term outdoor exposure without degradation
- Low VOC and non-toxic — Green Star compliant for sustainable projects
- Fast cure and paintable — increases jobsite efficiency and finish quality
Why Choose Megaprene 40GG Polyurethane Sealant:
- Highly flexible for dynamic joints — accommodates ±25% movement
- Exceptional durability — proven resistance in marine and industrial conditions
- Multi-substrate compatibility — works across nearly all Australian building materials
- Easy to use — one-component formula in a convenient 600ml sausage
Frequently Asked Questions About Megaprene 40GG Polyurethane Sealant
Q: Can Megaprene 40GG be used for sealing joints in water tanks?
A: Yes, Megaprene 40GG is certified to AS/NZS 4020, making it suitable for potable water contact. It is ideal for water tank seams, plumbing penetrations, and fixtures that require drinking water safety.
Q: Is priming always necessary before application?
A: Priming is not required for most surfaces. However, for critical joints or submerged conditions, use Adheseal 50A for non-porous materials and Everflex Supaprime for porous substrates like concrete and brick.
Q: Can Megaprene 40GG be painted?
A: Yes, it is paintable with most acrylic, oil, and rubber-based paints. Perform an adhesion test, especially with non-flexible coatings, which may crack due to movement of the sealant.
Q: What’s the best way to clean up after application?
A: While the product is still wet, clean tools and surfaces using Xylene. Once cured, it must be removed mechanically. Adheseal Hand Wipes are effective for skin contact.
Q: Can this product be used in hot and humid northern climates?
A: Yes, Megaprene 40GG is specifically formulated to perform in Australia’s tropical and humid zones. It resists UV, humidity, and mould growth, making it suitable for far north Queensland and NT.
Use Megaprene 40gg Gun Grade Polyurethane Joint Sealant for:
- Sealing vertical and horizontal joints in bridges and roadways.
- Sealing joints in car parks and driveways.
- Sealing joints in factory and warehouse floors.
- Sealing joints in service station driveways.
- General construction joint sealing where high flexibility and durability are required.
- Applications requiring potable water safety (AS/NZS 4020:2005).
Why Use Megaprene 40gg Gun Grade Polyurethane Joint Sealant:
- High Flexibility: Accommodates joint movement, ensuring a durable and long-lasting seal, preventing cracks and leaks.
- Fast Curing: Reduces downtime and allows for faster project completion, improving efficiency.
- Paintable: Allows for seamless integration with surrounding surfaces, providing a professional finish.
- Excellent Adhesion: Bonds strongly to most common building materials, ensuring a reliable seal, reducing the risk of failures.
- Potable Water Safe: Suitable for use with potable water, expanding application possibilities.
- Chemical Resistance: Provides durability in harsh environments, ensuring long-term performance.
Use Megaprene 40GG Polyurethane Sealant for:
- Expansion joints in precast concrete panels
- Sealing curtain walls and perimeter joints around windows
- Vehicular and marine body fabrication (metal/fibreglass bonding)
- Skirting boards, floor mouldings, and cladding
- Waterproofing below the waterline and around plumbing penetrations
Why Use Megaprene 40GG for:
- Extreme flexibility and UV stability — ideal for outdoor Australian conditions
- Water and fuel resistance — safe for vehicle, marine, and plumbing use
- Green Star compliant — meets low-VOC and potable water standards
- Time-saving single-pack format — easy to gun, tool, and finish on-site
Megaprene 40GG Polyurethane Sealant limitations:
- Not suitable for mirror bonding — use Hi-Power/MS609 with testing
- Avoid natural stone without stain testing — use S100 instead
- Do not use in totally confined spaces without air exposure — requires atmospheric moisture to cure
- Not for internal swimming pools or high-chlorine areas — chlorine max 5ppm
- Avoid use with copper, brass, and bituminous or EPDM rubber surfaces
Safety precautions when using Megaprene 40GG Polyurethane Sealant:
- Personal Protective Equipment: Wear nitrile gloves, safety glasses, long sleeves, and a respirator if ventilation is inadequate
- Ventilation: Use in well-ventilated areas; do not apply in enclosed spaces without airflow
- Handling: Avoid skin and eye contact. Do not ingest. Wash hands before eating or drinking
- First Aid: For inhalation, move to fresh air. For skin/eye contact, rinse thoroughly. If ingested, do not induce vomiting — seek medical help immediately
- Disposal: Dispose of in accordance with local regulations. Cured product may be treated as construction waste
Megaprene 40GG Polyurethane Sealant can be used on the following substrates:
- Concrete and masonry – ideal for structural expansion joints
- Brick and stone – ensure a clean, dry surface for best adhesion
- Porcelain and ceramic – roughen smooth tiles before application
- Metal (aluminium, steel) – except copper and lead; test for brass
- Timber – suitable for hardwoods and treated timbers
- Painted surfaces – remove loose or flaking paint beforehand
- Rubber and plastics – including PVC and fibreglass (test compatibility)
- Powder-coated surfaces – scuff lightly and use Adheseal 50A if needed
- Waterproof membranes – ideal for roof and deck sealing systems
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