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Achieving permanent, high-strength repairs on vertical or overhead concrete, bonding disparate materials, or filling gaps in critical infrastructure demands a material that holds its form and withstands harsh conditions. Megapoxy P1 is the non-sagging, heavy-duty epoxy paste formulated for exactly these challenges. It bonds, fills, and repairs across concrete, metal, and stone, even in potable water or hydrogen sulphide environments, without slumping.
Megapoxy P1 was engineered as a two-component, DGEBA epoxy resin-based adhesive, specifically designed for high-performance, gap-filling applications. Its carbonate-free formulation and non-sagging consistency make it ideal for structural repairs where form stability is critical. This product provides permanent, high-strength bonds with very low volatile organic compounds, making it suitable for sensitive environments like potable water infrastructure and sewage treatment plants.
Beyond its non-sagging profile, Megapoxy P1 delivers structural integrity. Its ultimate compressive strength of 80 MPa surpasses that of many concrete mixes, ensuring repairs are not just strong but permanent and load-bearing. A bond strength to concrete exceeding 3 MPa prevents delamination, while a tensile bond strength to steel of 18 MPa secures metal components. Crucially, the formulation boasts a very low VOC content of 4 g/l and maintains strength even after prolonged water immersion, validating its use in sensitive and wet conditions.
Megapoxy P1 features a simple 1:1 mixing ratio by volume, blending into a creamy, dark grey paste. This non-sag consistency ensures it stays where applied, even on vertical or overhead surfaces. With a 60-minute work time at 25°C, there is ample opportunity for placement and tooling. It cures under adverse conditions, including cold and damp, with a minimum application temperature of 10°C. For thorough tool cleanup, Megapoxy Thinners are recommended.
In comprehensive concrete repair and surface treatment systems, Megapoxy P1 often serves as a final, high-strength filler. It is frequently specified in sequences that begin with a dedicated primer, such as Megapoxy H 2-pack primer, ensuring optimal adhesion to the prepared concrete substrate before the application of P1 for permanent repairs or filling.
For applications requiring a flowable or self-levelling material, such as injecting fine cracks or grouting where gravity can assist, a different product is necessary. Megapoxy P1 offers a non-sagging, creamy paste for form-stable, high-strength bonding and filling, particularly for vertical, overhead, and gap-filling tasks. For flowable concrete repair needs or crack injection, alternative solutions like specific flowable grouts or injection resins are better suited.
Yes, absolutely. Megapoxy P1 has been independently tested and certified to AS/NZS 4020:2018, which is the Australian standard for products used in contact with potable water. This makes it ideal for repairing concrete water tanks, reservoirs, and pipes.
It is the most critical step for ensuring a structural bond. The substrate must be clean, sound, and mechanically abraded to remove all laitance, coatings, and contaminants. For steel, grit blasting is essential. A failure in preparation will lead to a failure in the bond.
Due to its non-sag paste consistency, Megapoxy P1 is excellent for vertical and overhead gap filling. For deep voids or bulk filling applications (e.g., deeper than 25mm), it is best practice to apply the material in layers, allowing each layer to partially cure, to prevent exotherm (heat generation) issues.
Once fully cured, Megapoxy P1 can withstand a continuous service temperature of up to 80°C. This ensures its high strength and bond properties are maintained in demanding industrial and infrastructure environments with significant temperature fluctuations.
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Structural Concrete Repair Fixing spalls, cracks, and damaged sections. |
Delivers compressive strength (80 MPa) far exceeding the concrete for a permanent, load-bearing fix. | Remedial Contractors, Civil Engineers, Builders |
| Grouting Bolts, Dowels & Anchors Securing structural elements into concrete. |
High bond strength and nil shrinkage ensures maximum pull-out resistance and reliable load transfer. | Civil Engineers, Precast Installers, Structural Steel Erectors |
| Bonding Precast Concrete Elements Filling gaps and creating structural joints. |
Fills voids to create a monolithic, waterproof, and structural joint between segments and articles. | Precast Manufacturers, Civil Contractors |
| Metal to Concrete Bonding Creating high-strength structural connections. |
Tenacious bond to properly prepared steel and concrete, perfect for fixing plates, tracks, or supports. | Structural Engineers, Fabricators, Builders |
| Potable Water Tank & Pipe Repair Sealing cracks and joints in water infrastructure. |
Fully certified to AS/NZS 4020:2018 for safe, compliant, and permanent repairs in drinking water systems. | Water Authorities, Plumbers, Council Maintenance |
The long-term performance of Megapoxy P1 is entirely dependent on the quality of surface preparation. All substrates must be clean, dry, and structurally sound.
Mechanically abrade the surface via grinding or grit-blasting to remove all laitance and contaminants. The ideal surface profile is clean with exposed aggregate.
Grit blast steel surfaces to a bright metal finish (AS CK 9.4-1964 Class 3). Degrease with a high-quality solvent like Adheseal Surface Prep. Do not wire brush.
Combine Part A (White) and Part B (Black) in a strict 1:1 ratio by volume. Mix thoroughly using a slow-speed drill with a paddle mixer or by hand on a mixing board.
Continue mixing until a completely uniform, streak-free, dark grey colour is achieved. Scrape the sides and bottom of the mixing container to ensure all material is incorporated.
Apply the mixed Megapoxy P1 to the prepared surface using a trowel or spatula. For bonding, apply to one surface and press the components together firmly. For repairs, build up the material to the desired profile.
The creamy, non-sag paste allows for easy tooling on vertical and overhead surfaces. Ensure good contact and pressure to eliminate any air voids.
Mandatory: Wear chemical-resistant gloves (nitrile rubber recommended), safety glasses with side-shields or chemical goggles, and long-sleeved protective clothing. Avoid all skin and eye contact.
Use in a well-ventilated area. If dust or vapours are generated during use, local exhaust ventilation is required to keep air concentrations below exposure standards.
Store in a cool, dry place out of direct sunlight. Keep containers sealed when not in use. Contaminated work clothing should not be allowed out of the workplace and must be washed before re-use.
Refer to the Safety Data Sheet (SDS) for full details. Seek medical attention immediately in all cases of serious exposure.
Surfaces must be structurally sound and free from all contaminants like grease, oil, dust, and curing compounds. Remove surface laitance via mechanical abrasion (grit blasting, scabbling, or grinding) to expose clean aggregate. The surface should be dry before application.
When bonding to a correctly prepared, sound substrate, Megapoxy P1 is self-priming. Ensure all loose material is removed after abrading.
All surfaces must be grit blasted to a Class 3 bright metal finish (AS CK 9.4-1964). Remove all rust, scale, and paint. Degrease the surface with an industrial grade solvent like Adheseal Surface Prep. Wire brushing is not sufficient and will result in minimal adhesion.
For protecting reinforcing steel, Megapoxy P1 can be applied directly to the prepared steel as a protective anti-corrosion barrier and bond coat before applying concrete patch repairs.
Ensure the surface is clean, dry, and completely free of any release agents, waxes, or oils. Thoroughly abrade the bonding area with 80-grit sandpaper to create a deep mechanical key, then wipe away all dust with a clean, dry cloth or a solvent wipe using Adheseal Surface Prep.
A direct bond to a clean and well-abraded fibreglass surface will yield excellent adhesion without the need for a primer.
| Property | Value |
|---|---|
| Appearance | Dark grey paste |
| Tensile Strength | 45 MPa |
| Compressive Strength | 80 MPa |
| Flexural Strength | 33 MPa |
| Bond Strength | >3 MPa |
| Shore Hardness | 75 |
| Pot Life | 60 minutes |
| Full Cure | 4 days |
| Application Temperature | 10°C |
| Service Temperature | 80°C |
| Mix Ratio | 1 Part A to 1 Part B |
| VOC Content | Nil |
| Certifications | AS/NZS 4020:2018 (Potable Water) |
Here are some common examples on where Megapoxy P1 used by our customers.
