1. What is the strongest glue in the world?

The cyanoacrylate glue Colle21 is one of the most powerful on the market. Thanks to his anaerobic formula, it creates an ultra-strong bond in seconds on almost any material.
🔧 Perfect for technical repairs and high-strength assemblies.

2. Which glue to use for plastic, metal, glass, ceramic or wood?

✅ Plastic, metal and ceramic → Colle21 Classic
✅ Glass and smooth surfaces → Colle21 with Activator21
✅ Wood and porous materials → Colle21 Densa or Gel
🔗 Discover our glues by materials

3. How to glue a broken object back together?

The main thing is to clean surfaces thoroughly and apply constant pressure.
🧼 Clean, apply a small amount of glue, then hold for 10-15 seconds.
🎯 Colle21 is activated only between two surfaces in contact: zero waste.

4. Is there a super glue that doesn't dry out in the bottle?

Yes: Colle21 is anaerobic, it does not dry in the open air.
📆 Lifespan: up to 12 months after opening, if stored vertically at room temperature.

5. Which glue is water and heat resistant?

Colle21 offer excellent resistance to humidity, vibration and moderate heat.
For extreme conditions, we recommend testing with Activateur21 depending on the materials.

6. Is there a transparent glue that does not yellow?

✅ Yes. Colle21 does not yellow over time, unlike many classic superglues.
💎 It offers a clean and invisible finish, perfect for glass, clear plastic and display items.

7. What is the difference between liquid, gel and dense glue?

• Liquid → penetrates micro-cracks, ideal for smooth surfaces
• Dense → perfect for absorbent materials or when you need control
• Gel → no dripping, ideal for vertical application or porous surfaces
  🔍 See our full range by clicking here

8. How to avoid sticking your fingers?

🧤 Use pliers or fine gloves for precision work
📦 Work on a clean surface away from dust
🚫 Never leave the bottle open near the sanding area!
Colle21 is precise, but it is always better to be vigilant.

9. What is the best glue for model making or fine repairs?

🎨 Colle21 is adored by modelers, craftsmen and designers.
✅ Ultra-thin tip
✅ Clean and strong bonds
✅ Compatible with hard plastics, resins, metal, wood and glass

10. Is there a glue for professional or industrial use?

🔧 Colle21 is used by:

• Dental technicians
• Mechanics
• Restaurateurs
• Fishermen and artisans
  🎯 A European professional glue, designed to offer performance, precision and reliability.