1. How to prevent adhesive leakage when stopping the caulking gun?
When using thin-bottle products, the bottle expands under pressure. To prevent leakage after releasing the trigger:
- Quickly press the metal spring plate (with your thumb) to neutralize the plunger’s forward momentum.
- This allows the bottle to contract slightly, minimizing leakage.
2. How to clean uncured/cured adhesive from hands or glass?
- Uncured: Wipe with acetone, xylene, or solvent No. 120.
- Cured: Scrape with a blade.
3. Why does acidic adhesive fail on cement?
Acidic adhesives react with alkaline materials (e.g., cement, stone), forming a chalky residue that weakens bonding.
4. Why does neutral adhesive wrinkle after curing?
Causes:
- Substrate expansion/vibration.
- Low-quality adhesive with excess plasticizers (shrinks as plasticizers evaporate).
- Solution: Apply ≥2mm thickness.
5. Why does neutral transparent adhesive turn yellow?
- Primary cause: Amine-based additives in crosslinkers.
- Triggers: Exposure to acidic adhesives, aging, or substrate reactions.
6. Powdery residue on cured neutral adhesive?
Causes:
- Poor raw materials.
- Uneven mixing.
- Dusty application environment.
7. Best adhesive for aquariums? Is water resistance guaranteed?
- Use high-quality acidic adhesive or aquarium-specific silicone.
- Fully cured silicone resists water immersion long-term.
8. Why do aquariums sometimes crack?
- Excessive water pressure (tank too large).
- Poor adhesive quality/application.
- Air bubbles in adhesive (check for voids after application).
9. Yellowing with PVC strips?
Low-quality PVC strips (high calcium carbonate content) react with silicone.
- Solution: Use premium PVC/silicone or skip strips entirely.
10. Grainy texture in adhesive?
Crystallization of crosslinkers in cold conditions. Harmless; grains dissolve post-curing.
11. Can structural sealant handle steam (100–120°C)?
- Yes, but acidic/neutral adhesives (150–200°C resistance) are more cost-effective for sealing.
12. Best adhesive for automotive glass?
- Avoid acidic adhesives (react with paint).
- Use neutral weatherproof or PU-based automotive sealants (fast cure) vs. silicone (durable but slower).
13. Stains behind mirrors?
- Acidic adhesives react with silver/copper mirror backings.
- Solution: Use alcohol-based neutral adhesive (avoid ketoxime types for copper).
14. Yellowing/mold in bathrooms?
- Moisture promotes mold. Use neutral mold-resistant adhesive (with fungicides).
15. Oil seepage from adhesive?
Low-quality silicones with petroleum plasticizers. Upgrade to 100% silicone adhesive.
16. Soft lumps/hard chunks/black spots?
Contamination during production (cured debris, unclean raw materials).
17. When to avoid acidic adhesive?
- Alkaline substrates (cement, stone).
- Copper, zinc, plastics (e.g., Teflon).
- High humidity/temperature extremes.
18. Why does neutral adhesive sag?
Poor thixotropy (too runny). Use higher-grade adhesive.
19. Grittiness in colored vs. clear adhesive?
Low-quality pigments. Ensure even mixing.
20. High-end acidic adhesive fails on aluminum/stainless steel?
- Premium silicones cure too fast for smooth surfaces.
- Low-grade adhesives (slower cure, softer) bond better.
21. Inconsistent viscosity in the same bottle?
- Poor mixing or expired product.
22. Bubbling on stainless steel doors?
Acidic adhesive reacts with impurities in low-quality stainless steel.
23. Slow curing in cold weather?
- Thick application.
- Expired/low-quality adhesive.
24. “Popping” sounds during application?
Air trapped in packaging. Use rigid bottles and store below 30°C.
25. Transparent adhesive turning white?
Plasticizer evaporation reveals white fillers. Apply ≥2mm thickness.
26. Bubbles in summer applications?
- Alcohol-based neutral adhesive releases methanol gas in heat.
- Solution: Use ketoxime-based adhesive in summer.
27. Pink tint in white adhesive?
Titanium complex reactions. Stabilizes to white after cooling.
28. Poor adhesion on aluminum/plastic?
- Use ketoxime-based neutral adhesive.
- Clean surfaces with acetone before application.
29. How to choose cost-effective adhesive?
- Verify net content vs. price.
- Prioritize certified structural adhesives for critical applications.
30. Compatibility testing?
- Formal tests at certified labs (for large projects).
- DIY tests: Apply adhesive to substrates, check adhesion after curing.
31. Do structural adhesives require manufacturer certification?
- Yes. Ensure compliance with national standards (safety-critical).
32. Why do large aquariums burst?
- Inadequate adhesive strength/flexibility. Use aquarium-specific silicone.
33. Selecting aquarium adhesive by size:
- Small tanks (≤0.3m): Standard silicone.
- Medium (0.3–0.8m): High-grade acidic.
- Large (≥0.8m): Professional aquarium silicone.
34. Preventing aquarium bursts:
- Use tempered/laminated glass.
- Layer adhesive (14-day cure between layers).
- Gradual water filling (1/3 increments over 3 days).
35. Bubbles in aquarium seams?
- Normal due to curing byproducts. Minimize with 23°C/50% humidity and layered application.
36. Cracks in aquariums?
- Uneven adhesive application or premature movement. Repair before curing.
37. Cracks/whitening after filling?
- Insufficient adhesive thickness or uneven layers.
- Solution: Apply ≥3mm adhesive; ensure uniform thickness.
