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🔍 The 10 Most Frequently Asked Questions About Glue (With Expert Answers from Colle21)
Choosing the right glue isn’t always easy. Every material, every situation, and every use requires the right adhesive. Here are the 10 most frequently searched questions by customers—along with professional answers from Colle21.
1. What is the strongest glue in the world?
Colle21 cyanoacrylate glue is one of the strongest on the market. Thanks to its anaerobic formula, it creates an ultra-strong bond in seconds on almost any material.
🔧 Perfect for technical repairs and high-resistance assemblies.
2. Which glue should I use for plastic, metal, glass, ceramic, or wood?
✅ Plastic, metal, and ceramic → Colle21 Classic
✅ Glass and smooth surfaces → Colle21 with Activateur21
✅ Wood and porous materials → Colle21 Dense or Gel
🔗 Discover our glues by material
3. How do I glue a broken object?
The key is to clean the surfaces properly and apply steady pressure.
🧼 Clean, apply a small amount of glue, and hold for 10–15 seconds.
🎯 Colle21 only activates between two surfaces in contact—no waste.
4. Is there a super glue that doesn’t dry out in the bottle?
Yes! Colle21 is anaerobic, so it won’t dry out in open air.
📆 Shelf life: up to 12 months after opening, if stored upright at room temperature.
5. Which glue is water- and heat-resistant?
Colle21 offers excellent resistance to moisture, vibrations, and moderate heat.
For extreme conditions, we recommend testing it with Activateur21 depending on the materials.
6. Is there a transparent glue that doesn’t yellow?
✅ Yes! Colle21 does not yellow over time, unlike many traditional super glues.
💎 It provides a clean, invisible finish, perfect for glass, clear plastic, and display items.
7. What’s the difference between liquid, gel, and thick glue?
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Liquid → penetrates micro-cracks, ideal for smooth surfaces
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Thick → great for absorbent materials or when more control is needed
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Gel → no dripping, ideal for vertical applications or porous surfaces
🔍 See our full range here
8. How can I avoid gluing my fingers together?
🧤 Use tweezers or thin gloves for precision work
📦 Work on a clean surface away from dust and debris
🚫 Never leave the bottle open near sanding zones!
Colle21 is precise—but better safe than sorry.
9. What is the best glue for model building or delicate repairs?
🎨 Colle21 is beloved by model makers, artisans, and creatives.
✅ Ultra-fine nozzle
✅ Clean, strong bonding
✅ Compatible with hard plastics, resins, metal, wood, and glass
10. Is there a glue for professional or industrial use?
🔧 Colle21 is used by:
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Dental prosthetists
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Mechanics
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Restorers
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Fishermen and craftsmen
🎯 A professional-grade European glue, designed to offer performance, precision, and reliability.
📦 Where to buy Colle21?
🛒 Available on our official website:
👉 www.colle21.com
📦 Also on Amazon with Prime delivery:
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🎯 Let’s stay glued with Colle21! 🚀
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