When it comes to adhesive sprays, 3M is a well-known and respected brand.
Their 77 and 90 products are two popular options for bonding a wide range of materials, but what are the differences between them, and which one should you choose for your project?
In this article, we’ll compare 3M 77 vs 90, looking at their features, benefits, and drawbacks, to help you make an informed decision.
Overview of 3M 77
3M 77 is a versatile adhesive spray that provides a strong, reliable bond for a variety of materials, including fabrics, plastics, foam, and metals. It dries quickly, within 15 seconds, and has a low soak-in, meaning it won’t saturate or warp delicate materials.
Its spray pattern is adjustable, allowing you to choose between a wide or narrow spray for more precise application.
3M 77 is also waterproof and heat resistant, making it suitable for outdoor and high-temperature applications.
Overview of 3M 90
3M 90 is a heavy-duty adhesive spray designed for bonding materials that require a strong, permanent hold, such as wood, metal, and plastic.
It has a longer open time than 3M 77, meaning you have more time to reposition the materials before the bond sets. It also has a higher solids content, making it more durable and resistant to impacts and vibrations.
3M 90 is not recommended for use on fabrics or materials that may be affected by solvents.
Comparison Table
To help you compare 3M 77 vs 90, here’s a handy table summarizing their key features:
| Feature | 3M 77 | 3M 90 |
|---|---|---|
| Materials | Fabrics, plastics, foam, metals | Wood, metal, plastic |
| Bond Strength | Medium | High |
| Open Time | 15 seconds | 1-5 minutes |
| Solids Content | Low | High |
| Spray Pattern | Adjustable | Fixed |
| Suitable for Fabric | Yes | No |
| Waterproof | Yes | No |
| Heat Resistant | Yes | No |
Which One Should You Choose?
Choosing between 3M 77 vs 90 depends on the type of materials you’re bonding, and the strength and durability required.
If you’re working with fabrics or delicate materials, 3M 77 is a good choice, as it won’t saturate or warp the materials, and it dries quickly.
However, if you need a strong, permanent bond for heavy-duty materials like wood and metal, 3M 90 is the better option, as it has a higher solids content and longer open time, allowing you to reposition the materials before the bond sets.
Tips for Using 3M Adhesive Sprays
- Always follow the manufacturer’s instructions for proper use and safety precautions.
- Use in a well-ventilated area, and wear protective gloves and eyewear.
- Test on a small area before applying to the entire surface.
- Apply in thin, even coats for the best results.
- Allow the adhesive to dry completely before handling the materials.
- Store in a cool, dry place, away from heat sources and direct sunlight.
Conclusion
In summary, 3M 77 and 90 are two popular adhesive sprays with different features and benefits.
3M 77 is versatile, quick-drying, and suitable for a wide range of materials, while 3M 90 is heavy-duty, with a strong and permanent bond for more robust materials.
When choosing between the two, consider the materials you’re working with, and the strength and durability required for your project.
Always follow the manufacturer’s instructions and safety precautions for the best results.
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