No, you should not use super glue to repair a car door mirror. While it might seem like a quick fix, super glue (cyanoacrylate adhesive) is fundamentally unsuitable for this automotive application. It creates a brittle bond that cannot withstand the constant vibrations, temperature extremes, and physical impacts a mirror endures. A proper repair involves either replacing the mirror or using a specialized automotive-grade adhesive designed for flexibility and durability.
The primary reason super glue fails is its lack of plasticity. It sets rigid and hard, meaning it cannot absorb the shocks and vibrations from daily driving. When exposed to the temperature swings of a car's exterior—from freezing cold to hot sun—the plastic mirror housing and the glued joint expand and contract at different rates. This thermal stress will quickly crack the brittle super glue bond. Furthermore, super glue does not adhere well to some types of plastics commonly used in mirror assemblies, leading to a weak connection from the start.
For a safe and lasting repair, you have two main options. The first is a complete mirror replacement, which is often the most reliable solution, especially if the mounting tabs are broken. The second is using a two-part epoxy adhesive specifically formulated for automotive plastics. These epoxy products create a strong, flexible bond that can handle vibration and temperature changes. Alternatively, heavy-duty urethane-based adhesives (like certain types of windshield adhesive) also provide the necessary strength and flexibility.
The table below compares the characteristics of super glue versus proper automotive repair methods.
| Adhesive Type | Bond Type | Temperature Resistance | Vibration Resistance | Estimated Repair Longevity |
|---|
| Super Glue | Rigid & Brittle | Poor (cracks under thermal stress) | Very Poor | Days to a few weeks |
| Automotive Epoxy | Flexible & Strong | Excellent (withstands -40°F to 250°F+) | Excellent | Several years |
| Mirror Replacement | Mechanical (bolts/clips) | Excellent (matches OEM part) | Excellent | Long-term (like original) |
| Urethane Adhesive | Very Flexible & Durable | Good (withstands typical weather) | Good | 1-3 years |
Attempting a fix with super glue is not just temporary; it's a safety hazard. A mirror that falls off while driving can distract you or become a danger to other motorists. For a critical component like a mirror, investing in the correct repair is the only responsible choice.
