Megapoxy PM

For structural bonding and repair jobs on vertical or overhead surfaces where sagging must be prevented, Megapoxy PM provides a non-sag epoxy adhesive paste that holds its position. When properly mixed, this two-part epoxy paste secures heavy materials like precast concrete, natural stone, and metals without slipping, and it will not stain or discolour white or light-coloured marble and ceramics.

High-strength structural bonding

Megapoxy PM cures to a high-strength permanent bond with compressive and tensile strengths that exceed those of standard concrete. Its creamy, easily blended texture allows for direct application to vertical joints, concrete pipe repairs, and overhead grouting without dripping. It retains its physical properties after prolonged immersion in water and is formulated to adhere and cure under cold and damp conditions, making it reliable for field repairs on insitu formed concrete and water tanks.

Numbers that matter

• 80MPa compressive strength (ASTM D695-23): High load-bearing capacity for structural precast concrete bonding and concrete column repairs.
• >3MPa concrete bond strength (ASTM 4541): Stronger than the cohesive strength of concrete, ensuring the substrate fails before the bond line.
• 20MPa tensile bond strength on steel (ASTM D897-08): High-capacity structural adhesion when bonding metal to metal or concrete.
• 1:1 mix ratio by volume: Equal parts of A and B simplifies onsite measurement and mixing.
• 45-minute work time (at 25°C): Practical wet-edge window to align natural stones, flush-fill countersunk screws, or position precast elements.
• Cure windows: Minimum cure time is 48 hours at 15°C, 24 hours at 25°C, and 12 hours at 35°C (minimum application temperature 10°C).

Where to use it

• Bonding: Precast concrete articles, metal to metal, metal to concrete, natural stones, bricks, ceramics, and compressed cement sheet.
• Filling and repair: Concrete pipes, concrete tanks, fibreglass articles, concrete floors, stairs, columns, and insitu formed concrete.
• Fastening: Grouting bolts into concrete and flush-filling countersunk screws in fibre cement sheet.

Limitations

• Mixing precision: Strict adherence to the 1:1 ratio and thorough mixing is essential. Inaccuracies or poor mixing will reduce the physical properties of the cured system, and may prevent a satisfactory cure or cause discolouration on ageing.
• Coated surfaces: All paint, galvanising, and coatings must be removed before bonding. Bonding to coated surfaces will result in inferior bond strength compared to a prepared, bare substrate.
• Surface preparation limits: Wire brushing is not satisfactory and provides minimal adhesion only. Metals must be prepared to a bright finish, and concrete must be clean, dry, and free of laitance.
• Operating temperature limit: Maximum operating temperature is 70°C.

Surface preparation

Concrete: Must be free from grease and oil. Clean with an industrial heavy-duty degreaser if required. Remove surface laitance using mechanical abrasion (scabbling, grit blasting, or grinding). If mechanical preparation is not possible, acid etch using a 1:1 mix of concentrated hydrochloric acid and water spread at 0.5 litres per square metre. Allow to react for 10 minutes, scrub with a stiff broom, wash thoroughly, and allow to dry for 24 hours. Concrete should be surface dry for maximum adhesion.

Metal: Grit blast to AS CK 9.4 - 1964 Class 3 finish. If grit blasting is not possible, mechanically abrade to a clean, bright metal surface, then degrease by flooding with industrial grade degreaser.

Coated surfaces: Remove all coatings before bonding. For concrete, flame-clean or use a scutching tool to remove paint, then complete by diamond grinding or scabbling. For metals, remove paint and galvanising with a high-quality paint stripper, followed by grit blasting or grinding to a bright metal finish.

Cleanup: Use Megapoxy Thinners to clean mixing implements and tools before the epoxy cures. Wear disposable rubber gloves during application and cleanup.