For treating damp surfaces, masonry, and green concrete, Megapoxy 154 is a two-component water-based epoxy designed to prime, seal, and provide a moisture barrier before laying down floor finishes or secondary membranes. It cures to a matte, chemical-resistant coating that tolerates foot traffic and light vehicular traffic in large commercial spaces like car parks and warehouses.
Megapoxy 154 combines epoxy adhesion with the practical application benefits of a water carrier, allowing it to penetrate and bond directly to damp concrete substrates. The mixed formula acts as a concrete curing membrane, a dust sealer for interior concrete floors, or a moisture barrier on damp surfaces before installing timber or vinyl overlays. It is also suitable as a primer for acrylic and polyurethane membranes (excluding WBE Clear), ensuring a sound bond key on porous masonry and concrete.
All surfaces must be structurally sound and clean of previous coatings, adhesives, efflorescence, laitance, grease, and oil by grinding, shot blasting, high-pressure water washing, or mechanical scrubbing. Repair all holes and non-structural cracks with suitable Megapoxy repair compounds before priming.
Mix 1 Part A to 1 Part B by volume in a clean mixing vessel for a minimum of 3 minutes. If thinning, up to 25% water may be added and mixed until completely homogeneous after the resin and hardener are fully mixed. Do not mix Part A, Part B, and water at the same time. In cold temperatures, mix for at least 1 extra minute and let the mixed batch stand for 5 minutes to accelerate drying. For best results, store the kit at 20°C for 24 hours prior to mixing.
Megapoxy 154 requires a minimum of two coats, applied with a brush or roller at right angles to the previous coat to fill voids and eliminate pinholes. Test the wet film depth at random points during application with a wet film gauge. For porous concrete, a third coat may be required. For non-slip finishes, mix a fine epoxy-grade sand aggregate directly into the wet mix, or broadcast coarser aggregate directly into the first wet coat and seal with subsequent coats. Clean all mixing tools and equipment with Megapoxy Thinners immediately after use.
No, Megapoxy 154 is not a waterproofing membrane on its own. It functions as a moisture barrier and primer, but a dedicated waterproofing membrane is required for full protection.
Megapoxy 154 provides excellent adhesion and penetration to damp surfaces and green concrete. This allows for priming and sealing earlier, reducing waiting times before applying vinyl, timber overlays, or other membranes.
Apply above 10°C to prevent slow curing and amine blush, which appears as an oily residue. Ensure adequate mixing and allow mixed material to stand for 5 minutes to accelerate drying time. Warm the substrate surface if needed.
Megapoxy 154 will chalk and yellow when exposed to UV light. For external use, always apply a UV-resistant topcoat to maintain aesthetic and performance. It is not suitable for steel or metal surfaces.
| Application | Key benefit | Primary trades |
|---|---|---|
| Primer for damp or green concrete | Achieves excellent adhesion and penetration, allowing earlier application of subsequent overlays and membranes. | Concrete contractors, flooring installers |
| Moisture barrier for concrete slabs | Seals concrete before vinyl and timber overlays, mitigating moisture-related failures and ensuring bond. | Flooring contractors, builders |
| Dust sealing for interior concrete floors | Provides a tough, chemical-resistant matte coating, reducing dust generation in high-traffic areas. | Warehouse managers, commercial builders |
| Protective coating for traffic areas | Offers resistance to chemicals, foot traffic, and light vehicular traffic in car parks and warehouses. | Flooring applicators, facility maintenance |
| Concrete curing membrane | Assists in the proper curing of concrete, enhancing its long-term durability and surface integrity. | Concrete placers, civil contractors |
The Engineering Challenge: A below-grade concrete slab is persistently damp due to ambient moisture, preventing the application of standard solvent-based primers and membranes. Waiting an unknown time for the slab to fully dry is not an option.
The System-Based Solution with Megapoxy 154: After cleaning the surface, apply two coats of Megapoxy 154 directly to the damp concrete. Its water-based formulation will penetrate and cure, creating a sealed, high-adhesion surface. After a 24-hour cure, this surface is ready to receive a compatible waterproofing membrane system, ensuring a reliable bond.
Best Practice Note: Application in high humidity (>80% RH) will dramatically slow the cure rate. Ensure good ventilation and air movement to facilitate water evaporation from the coating film.
The Engineering Challenge: A large, newly poured concrete warehouse floor needs to be covered with vinyl flooring on a fast-track schedule. Waiting the traditional 28 days for the concrete to cure and dry would cause major project delays.
The System-Based Solution with Megapoxy 154: As soon as the green concrete can be walked on, apply a two-coat system of Megapoxy 154. This acts as both a curing compound and a moisture barrier. The floor can then be prepared for the vinyl overlay weeks ahead of schedule, with the confidence that residual moisture from the slab is sealed off.
Best Practice Note: Porous or roughly finished concrete may require a third coat to achieve a complete, pinhole-free seal. Always check the surface after the first coat to assess if additional material is needed.
Part B causes severe skin burns and eye damage. Both Part A and Part B may cause an allergic skin reaction.
Wear safety shoes, nitrile rubber gloves, and safety glasses. A suitable respirator is recommended to avoid breathing vapours, mists, or aerosols.
Ensure adequate natural ventilation during application and curing. In enclosed areas like basements, provide ventilation to assist evaporation and prevent fume accumulation.
Store in a cool, dry, well-ventilated place away from direct sunlight, foodstuffs, heat, and ignition sources. Keep containers upright and closed. Megapoxy 154 Part B is corrosive and should be stored locked up. Dispose of contents and containers according to local regulations. Both components are Schedule 5 poisons.
Proper substrate preparation is critical for Megapoxy 154 to achieve optimal adhesion and performance, preventing coating failures.
Surface prep: Ensure all surfaces are structurally sound. Mechanically remove existing coatings, adhesives, efflorescence, or laitance through grinding, abrasive blast cleaning, high-pressure washing, or mechanical scrubbing. Clean surfaces thoroughly, removing all dirt, grease, oil, and other contaminants. Repair non-structural cracks and deformities with appropriate Megapoxy repair products before application.
Primer: Not required. Megapoxy 154 acts as its own primer for these surfaces.
Surface prep: Follow all preparation steps for concrete. The product is formulated for application on damp and green concrete, but standing water must be removed.
Primer: Not required. Megapoxy 154 is specifically designed for excellent adhesion and penetration on damp and green concrete, functioning as a primer and moisture barrier.
| Property | Value |
|---|---|
| Product Family | Water Based Epoxy Sealer |
| Mixing Ratio by Volume | 1 Part A : 1 Part B |
| Work Time at 25°C | 60 minutes |
| Minimum Thin Film Cure Time at 25°C | 140-180 minutes |
| Minimum Application Temperature | 10°C |
| Maximum Operating Temperature | 80°C |
| Colour Part A | White |
| Colour Part B | Brown |
| Colour Mixed | White |
| Specific Gravity Part A at 25°C | 1.05 - 1.10 |
| Specific Gravity Part B at 25°C | 0.95 - 0.99 |
| Mixed Specific Gravity at 25°C | 1.02 |
| Part A Viscosity at 25°C | 20,000 - 30,000 mPa.s |
| Part B Viscosity | 110 - 145 Pas |
| Part A pH at 20°C | ca. 7 |
| Part B pH at 20°C | ca. 10 |
| Part A Flash Point | >100°C |
| Part B Flash Point | >100°C |
| Application Rate Smooth Finish | 5 - 8 m²/litre |
| Minimum Coats | 2 coats |
| Packaging | 20L kits |
Here are some common examples on where Megapoxy 154 used by our customers.
