Megaprene 40 - Gun Grade Polyurethane Joint Sealant

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Price Per Unit: $10.30

Price Per Box: $9.27

Megaprene is a single-component gun grade moisture-curing polyurethane construction sealant.
Vendor: Adheseal
Availability: In Stock

Physical Properties

Type of product: Polyurethane
Curing system: Moisture cured
Density (specific gravity): 1.2
Consistency: Paste
Shore a hardness: 25
Application temperature: +5°c to +40°c
Storage: Cool dry between 10°c and 35°c
Movement capability: ±25%
Tack free time: 2hrs @ 23°c & 60% rh
Cure speed: 3mm/24 hours
Shelf life: Minimum 12 months in original packaging
Clean up: Uncured material can be removed using industrial strength solvent such as xylene or mineral turps
Colours: Grey/black
Packaging: 600ml sausage / 20 per carton

Shipping & Delivery

$15.95 shipping on all orders nationwide, except for DG goods.

Megaprene 40 - Gun Grade Polyurethane Joint Sealant

Vendor: Adheseal

Megaprene 40 - Gun Grade Polyurethane Joint Sealant


Vendor: Adheseal

Megaprene 40 - Gun Grade Polyurethane Joint Sealant

Size: 600ml
Colours: Concrete Grey
Package Type: Single Buy

Megaprene 40gg is a high-performance, single-component, gun-grade polyurethane construction sealant designed for diverse applications. Its rapid curing, non-sag formula provides exceptional flexibility and tear resistance, making it ideal for demanding projects. Megaprene 40gg exhibits strong adhesion to common building materials and offers good resistance to chemicals and intermittent fuel spills. Additionally, it is paintable, allowing for seamless integration with various finishes.

Key Features:

  • Highly Flexible
  • Non-Sag
  • Fast Curing
  • Paintable
  • Tear Resistant
  • Excellent Adhesion

Suitable Substrates:

  • Concrete
  • Most common building materials (testing recommended)


  • Tested to AS/NZS 4020:2005 for use with potable water
  • Meets Spec. ASTM C-920 & SNJF Class 1 Elastomeric


  • Vertical & horizontal joints in bridges and roadways
  • Car parks
  • Driveways
  • Factory & warehouse floors
  • Service station driveways


  • Strong and durable sealant for long-lasting performance
  • Excellent flexibility to accommodate joint movement
  • Fast curing for quick project completion
  • Paintable for a seamless finish
  • Tear-resistant for enhanced durability
  • Superior adhesion to various substrates

Application Guide

  1. Ensure substrates are sound, clean, and free from contamination.
  2. If necessary, prime the substrate with the appropriate primer.
  3. Priming is recommended for concrete floor joints using Primer 2001. For suspect surfaces, adhesion testing is recommended. Apply the correct primer and allow it to dry when required.
  4. Use Adheseal Backing Rod open cell where required. Closed cell backer rod is also suitable but avoid damaging the outer skin to prevent gassing in the sealant. Bond breaker tape is necessary for joints where backer rod cannot be used.
  5. Fill the prepared joint completely, taking care not to entrap air. Dry tool immediately before the sealant skins. Tooling time is a minimum of 10 minutes depending on temperature and humidity. Joint depth must be half the depth of the width with a minimum depth of 10mm.


Not suitable for internal swimming pool applications.

Additional Information

  • Megaprene 40gg is paintable with most commonly available paints. Testing is recommended. Megaprene 40gg must be fully cured before paint is applied. Failure to do this can result in retarding of the curing of the PU sealant and the paint topcoat resulting in a tacky surface.
  • Uncured material can be removed using industrial strength solvent such as Xylol or mineral turps.

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