Megapoxy 69

For high-load structural joinery, marine assembly, and stone fabrication where components are subject to repeated high-impact forces, Megapoxy 69 provides a permanent bond with a non-sag, gel-type consistency. It secures metals, timber, granite, marble, and fibreglass on vertical and overhead surfaces without slumped joints or running adhesive.

What it does

Megapoxy 69 is a translucent structural adhesive gel that bridges gaps and fills voids, splits, cracks, and knot holes. It cures to a tough, light yellow finish that absorbs vibration and mechanical shocks without losing adhesion. With a balanced 1:1 mix ratio by volume, the creamy gel mixes smoothly and clings to vertical masonry and steel details during application. Once fully cured, it achieves a compressive strength of 120MPa and a tensile bond strength of 19MPa on steel, ensuring the structural connection is stronger than the concrete substrate itself.

Numbers that matter

• 120MPa ultimate compressive strength (ASTM C579): High compressive load-bearing capability for civil engineering, concrete column repairs, and heavy stone installations.
• 45-minute work time (at 25°C): Practical window to align heavy steel, timber joints, or stone panels before the adhesive begins to set.
• 24-hour minimum cure time (at 25°C): Reaches full structural handling strength in 24 hours at standard temperatures, or 12 hours at 35°C (extends to 48 hours at 15°C).
• 19MPa tensile bond strength on steel (ASTM D897): High-strength structural connection for direct metal-to-metal and metal-to-concrete applications.
• 3 g/l VOC (ASTM D3960): Extremely low volatile organic compound level, suitable for sensitive interior fit-outs and green-certified builds.

Where to use it

Megapoxy 69 bonds and repairs a wide range of structural materials:

• Metals: Steel-to-steel connections, aluminium fabrications, and bonding metal fixtures to concrete or masonry.
• Natural stone: Assembly and structural laminating of granite and marble fabrications.
• Timber and marine: High-strength structural timber joinery and permanent bonds in demanding marine service conditions.
• Repair and filling: Filling cracks, splits, knot holes, concrete column voids, and infills in stone and steel.
• Other substrates: Bricks, ceramics, masonry, and fibreglass.

Limitations

• Do not use on coated surfaces: Bonding to paint, galvanising, or other coatings reduces bond strength. All coatings must be removed to expose the bare, prepared substrate before application.
• Avoid simple wire brushing on metals: Wire brushing alone does not provide sufficient mechanical keying and results in minimal adhesion.
• Temperature limit: Do not apply when substrate or ambient temperatures are below 10°C.
• Mixing precision: Incorrect mixing ratios or incomplete blending of Part A (White) and Part B (Light Yellow) will degrade the physical properties, prevent a complete cure, and cause discolouration as the adhesive ages.

Substrate preparation

To ensure structural adhesion, prepare surfaces according to these steps:

• Concrete: Must be free of grease and oil. Remove surface laitance by scabbling, grit blasting, or grinding. If acid etching is required, apply a 1:1 mix of hydrochloric acid and water at 0.5 litres per square metre, let react for 10 minutes, scrub with a stiff broom, rinse thoroughly, and allow to dry for 24 hours until surface dry.
• Metal surfaces: Grit blast to AS 1627.2.2002 or mechanically abrade to clean, bright metal. Degrease immediately after abrasion by flooding the surface with an industrial-grade degreaser.
• Coated surfaces: Remove paint from concrete using flame-cleaning or a scutching tool, followed by diamond grinding or scabbling. Remove paint and galvanising from metals with a quality paint stripper, then grit blast or grind to a bright metal finish.