Rayhong Metal Repair Glue, Strong Adhesive Epoxy for Ceramic,Car, Pipe, Tank, Casting & Metal Surface Repairs – Waterproof, Heat Resistant, Durable Fix Magic Metal Repair Weld Glue, Adhesive Paste Gel Multi Purpose with Push Rod

The Metal Repair Adhesive you described is a high-strength, two-part epoxy glue that creates a permanent, iron-hard, and highly resistant bond suitable for a wide range of repairs on metal and other materials. 

Key Features and Properties

• Composition: The adhesive is a two-component system (A and B, typically resin and hardener) mixed in a 1:1 volume ratio. This chemical reaction (curing) results in a durable thermoset plastic material.
• Durability and Resistance: Once fully cured (after 24 hours), the bond is waterproof, corrosion-resistant, and as hard as iron. It can withstand a broad temperature range from -60°C to 150°C (-76°F to 302°F). The cured material can also be shaped, tapped, filed, sanded, or drilled.
• Bond Strength: It offers significant bonding strength, with a shear strength of over 20 MPa (200kg/M2) after 24 hours of curing, making it ideal for structural applications. 

Applications

The adhesive is a versatile alternative to traditional welding or soldering for heavy-duty repairs. 

• Metal Casting Repairs: Its primary use is to fill defects such as blisters, pores, cracks, and gaps in metal and steel castings (iron, steel, aluminum, copper, etc.).
• General Repairs: It is widely used in automotive and marine components (fuel tanks, pipes, car bumpers, engines), household appliances, and for bonding various other hard materials, including hard plastics, wood, stone, and ceramics. 

Usage and Handling

The application process is straightforward but requires adherence to specific steps for optimal performance: 

1. Preparation: The surfaces to be repaired must be thoroughly cleaned and dried, free from dirt, oil, or grease. Roughening smooth surfaces with sandpaper improves adhesion.
2. Mixing: Mix equal parts of components A and B in a 1:1 ratio until a uniform color is achieved. The mixed product has a limited "pot life" or working time of about 20 minutes before it starts to harden, so work quickly.
3. Application and Curing: Apply the mixture to the prepared surface(s), bring the parts together, and apply slight pressure or use a clamp to hold them in place. Initial solidification takes about 1.5 hours, but a full cure and maximum strength are reached after 24 hours.
4. Storage Note: If the adhesive is slightly hardened due to cool temperatures, you can soak the tubes in hot water to soften it before use. 

For safety, wear protective gloves and ensure adequate ventilation during use.