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Megapoxy P1 is a structural two-component epoxy paste adhesive specifically formulated for civil engineering and remedial concrete applications in aggressive environments. This DGEBA-based resin provides 80MPa compressive strength and a no-sag consistency, ensuring permanent load-bearing repairs on vertical and overhead surfaces without shrinkage.
Fully compliant with AS/NZS 4020:2018 for drinking water contact and resistant to hydrogen sulphide (H2S), it serves as a critical barrier where concrete cover is insufficient, with a 3mm layer providing protection equivalent to 50mm of standard concrete.
Frequently Asked Questions
Can Megapoxy P1 be used in contact with drinking water?
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.
How critical is surface preparation before applying Megapoxy P1?
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.
What is the maximum gap that Megapoxy P1 can fill?
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.
What is the service temperature range of fully cured Megapoxy P1?
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.
Applications & Benefits
| 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 |
Applying Megapoxy P1: Enhanced Protocols & Best Practices
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Step 1: Surface Preparation
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.
Concrete & Masonry
Mechanically abrade the surface via grinding or grit-blasting to remove all laitance and contaminants. The ideal surface profile is clean with exposed aggregate.
Metal Surfaces
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.
Pro Tip: After abrading, remove all dust from the substrate with a vacuum or oil-free compressed air. Even a fine layer of dust can compromise the bond. -
Step 2: Mixing
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.
Visual Check for Thoroughness
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.
Work Time: You have approximately 60 minutes of work time at 25°C. This time will be shorter at higher temperatures and longer at lower temperatures. Only mix as much material as can be used within this timeframe. -
Step 3: Application & Curing
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.
Tooling & Finishing
The creamy, non-sag paste allows for easy tooling on vertical and overhead surfaces. Ensure good contact and pressure to eliminate any air voids.
Cure Time: The product achieves initial cure in 24 hours at 25°C, and full cure with maximum properties in 4 days. Do not subject the bond to high loads until a full cure is achieved.Pro Tip: For cleaning un-cured epoxy from tools and equipment, use Megapoxy Thinners. Once cured, the material must be removed mechanically.
Limitations & Safety
Product Limitations
Minimum application temperature is 10°C. Application below this temperature will significantly extend cure times and may compromise performance.
Not intended for use on substrates with active water leaks or negative-side hydrostatic pressure.
For Professional Use Only. This product requires advanced surface preparation techniques and adherence to strict safety protocols outlined in the SDS. It is not suitable for DIY or general handyman use.
Safety & Handling Requirements
Personal Protective Equipment
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.
Ventilation Requirements
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.
Handling & Storage
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.
Emergency First Aid
Eyes:
Immediately hold eyelids apart and flush continuously with running water for at least 15 minutes. Urgently seek medical attention. Part B can cause serious eye damage.
Skin:
Remove contaminated clothing and wash skin thoroughly with soap and water. If irritation or rash occurs, get medical advice.
Inhaled:
Remove victim from exposure to fresh air. Keep at rest in a comfortable position. Seek medical advice if effects persist.
Swallowed:
Rinse mouth with water. Do NOT induce vomiting. Give a glass of water to drink. Seek immediate medical advice.
Refer to the Safety Data Sheet (SDS) for full details. Seek medical attention immediately in all cases of serious exposure.
Substrate Adhesion & Preparation Guide
Concrete & Masonry
Surface Preparation
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.
Primer Requirements
No primer typically required
When bonding to a correctly prepared, sound substrate, Megapoxy P1 is self-priming. Ensure all loose material is removed after abrading.
Steel (Mild, Galvanised, Reinforcing)
Surface Preparation
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.
Primer Requirements
Self-priming for corrosion protection
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.
Fibreglass & Composites
Surface Preparation
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.
Primer Requirements
No primer required
A direct bond to a clean and well-abraded fibreglass surface will yield excellent adhesion without the need for a primer.
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