For bonding natural stones and tiles to masonry substrates where staining or moisture sensitivity is a risk, Megapoxy Megabond provides a high-strength, structural epoxy connection. This VOC-free, 100% solids adhesive cures to an off-white finish that will not stain light-coloured marbles, making it suitable for high-exposure miter joints, stone repair, and structural bonding on both interior and exterior installations.
Megabond is formulated for high shock and chemical resistance, curing to physical properties that exceed the strength of standard concrete. Its creamy, non-sagging texture is designed to spread easily with a notched trowel, allowing installers to set large-format tiles, bond compressed cement sheet, or secure precast concrete articles without slippage. The formula can also be tinted with Megapoxy coloured pigment pastes to match specific stone selections or to blend repairs when patching chipped stone edges and filling voids.
This adhesive bonds to stone, tile, cement sheet, cement render, plasterboard, timber, concrete, and metal. Typical applications include:
For successful adhesion, substrates must be properly prepared before mixing the 1:1 ratio:
Yes, Megabond is designed for structural concrete repairs, including floors, stairs, and columns. It achieves a compressive strength of 60MPa, which is superior to concrete itself, ensuring durable repairs.
No, Megabond is formulated not to stain light-coloured marbles and is suitable for bonding water-sensitive and composite stone. This maintains the aesthetic integrity of sensitive materials.
Metal surfaces require grit blasting to AS CK 9.4 - 1964 Class 3, or mechanical abrasion to a clean, bright finish. Degrease thoroughly after abrasion; wire brushing alone will not achieve adequate adhesion.
Inaccurate mixing or insufficient blending will reduce the physical properties of the cured epoxy. This can lead to bond failure, lower strength, unsatisfactory cure, and potential discolouration over time.
| Application | Key benefit | Primary trades |
|---|---|---|
| Bonding natural stone and tile | Will not stain light-coloured marbles; secures water-sensitive and composite stone permanently. | Stonemasons, tilers |
| Structural bonding of precast concrete and metal | Achieves 60MPa compressive strength and 10MPa tensile bond to steel, creating bonds superior to concrete. | Precast manufacturers, concrete repairers, steel fabricators |
| Filling and repairing concrete defects | High strength (60MPa compressive) for durable repairs to floors, stairs, and columns; excellent chemical resistance. | Concrete repairers, civil contractors |
| Bonding compressed cement sheet, plasterboard, and timber | Forms strong, permanent bonds on various masonry and timber substrates for interior and exterior use. | Builders, carpenters, tilers |
| Bonding metal to metal, forming miter joints | High tensile shear strength (6MPa) and flexural strength (50MPa) for precise, strong metal assemblies. | Metal fabricators, stonemasons |
Use disposable rubber gloves to protect hands during mixing and application. Maintain proper industrial hygiene practices.
Store Megapoxy Megabond kits in a cool, dry place. Unused material should be disposed of in accordance with local regulations for epoxy resins.
Proper surface preparation is crucial for Megapoxy Megabond to achieve its documented high bond strengths and prevent early failure.
Surface prep: Remove all grease, oil, and surface laitance. Mechanical abrasion (scabbling, grit blasting, or grinding) is preferred. If not possible, acid etch with a 1:1 hydrochloric acid and water mix at 0.5 L/m². Allow 10 minutes to react, then wash thoroughly and scrub. Allow 24 hours to dry; the surface must be dry for maximum adhesion.
Primer: Not required. Megabond bonds directly to prepared concrete.
Surface prep: Grit blast to AS CK 9.4 - 1964 Class 3 finish. Alternatively, mechanically abrade to a clean, bright metal surface. After abrasion, degrease the surface with an industrial-grade degreaser. Wire brushing is insufficient for reliable adhesion.
Primer: Not required. Megabond bonds directly to prepared metal.
Surface prep: All existing coatings must be completely removed prior to bonding. For concrete, flame-clean or scutch paint, then diamond grind or scabble. For metals, use quality paint stripper, then grit blast or grind to a bright metal finish. Bonding to coated surfaces yields inferior strength.
Primer: Not required. The goal is direct bond to the base substrate.
| Property | Value |
|---|---|
| Mixing Ratio by Volume | 1 Part A to 1 Part B |
| Work Time at 25°C | 45 minutes |
| Minimum Cure Time at 15°C | 48 hours |
| Minimum Cure Time at 25°C | 24 hours |
| Minimum Cure Time at 35°C | 12 hours |
| Minimum Application Temperature | 10°C |
| Maximum Operating Temperature | 80°C |
| Colour Part A | White |
| Colour Part B | Natural |
| Appearance Mixed | Off White |
| Compressive Strength (ASTM D695-23) | 60 Mpa |
| Bond Strength Concrete (ASTM D4541) | >3 Mpa |
| Tensile Bond Strength Steel (ASTM D897-08) | 10 Mpa |
| Modulus of Elasticity (ASTM D695) | 2 Gpa |
| Flexural Strength (ASTM D790-17) | 50 Mpa |
| Tensile Strength (ASTM D638-22) | 18 Mpa |
| Tensile Shear Strength (ASTM D1002-10) | 6 Mpa |
| Hardness (Shore D - ASTM D2240-00) | 70 |
| Coefficient of Linear Thermal Expansion, Mean | 60 x 10-6 mm/mm/°C |
| VOC Content | VOC Free |
Here are some common examples on where Megapoxy Megabond used by our customers.
