Rearview Mirror Repair: How to Reattach a Mirror That Fell Off Your Windshield

Key Takeaways

A rearview mirror that detaches from the windshield can be reglued in about 5 minutes with a $5 rearview mirror adhesive kit
The kit includes a cleaning solution and special adhesive — do not use regular super glue
Clean the mounting surface thoroughly and let it dry for 2 to 4 minutes before applying adhesive
Remove the mirror bracket from the mirror assembly before gluing — you glue the small metal bracket, not the entire mirror
Hold the bracket firmly in place for at least 60 seconds to allow the adhesive to set

Why Rearview Mirrors Fall Off

One morning you get in your car and discover your rearview mirror dangling by its wires or sitting on the dashboard. It happens more often than you might think, and there are several common causes:

Temperature fluctuations — Extreme heat or cold causes the glass and adhesive to expand and contract at different rates, weakening the bond over time
Vibrations — Road vibrations gradually loosen the adhesive, especially on vehicles with stiffer suspensions or rough road conditions
Previous windshield repairs — In my case, the mirror likely fell off as a result of vibrations from a previous windshield crack repair. The repair process and the crack itself may have stressed the glass near the mirror mount
Age — Factory adhesive simply degrades over time. On a vehicle that is 10 or more years old, the original bond may have weakened significantly

Whatever the cause, the fix is simple and inexpensive. You do not need to go to a glass shop or dealership for this repair.

What You Need

The only thing you need to buy is a rearview mirror adhesive kit. I used a Permatex rearview mirror adhesive kit, which costs about $5 at any auto parts store. The kit comes with two components:

Cleaning/activator solution — Prepares the glass surface for bonding
Adhesive — A specially formulated glue designed to bond metal to glass

You will also need:

A Phillips or flathead screwdriver (to detach the mirror from its bracket)
A clean, lint-free cloth or paper towel
About 5 minutes of time

Why Not Regular Super Glue?

You might be tempted to grab regular cyanoacrylate (super glue) from your junk drawer. Do not do this. Regular super glue is not designed for the glass-to-metal bond that a rearview mirror requires. It does not handle temperature cycling well, and it becomes brittle over time. The purpose-built rearview mirror adhesive is formulated to remain flexible through temperature extremes and resist vibration-induced fatigue. For $5, it is not worth cutting corners.

Step-by-Step Repair Process

Step 1: Remove the Mirror From the Bracket

The rearview mirror assembly typically consists of two parts: the mirror itself (the large piece you adjust) and a small metal mounting bracket (the button that attaches to the glass). These two pieces connect with a screw or a slide-on mechanism.

Use a screwdriver to separate the mirror from the bracket. You want to work with just the small metal bracket during the gluing process — it is much easier to hold in place precisely, and the weight of the full mirror assembly would pull it down before the adhesive sets.

Step 2: Clean the Mounting Surface

Open the cleaning/activator solution from the kit. Apply it to both surfaces:

The area on the windshield where the bracket will attach
The flat side of the metal bracket that contacts the glass

The cleaning solution removes oils, dirt, and old adhesive residue. It also chemically activates the glass surface for better adhesion. Apply the solution and then do not touch the cleaned surfaces with your fingers — skin oils will contaminate the bond.

Step 3: Wait for the Surfaces to Dry

Let both surfaces air dry completely. This takes about 2 to 4 minutes depending on temperature and humidity. The surfaces should be completely dry and free of any visible moisture before you apply the adhesive.

Step 4: Choose Your Mounting Location

This is where you have a decision to make. If your windshield has any damage (cracks, chips, previous repairs), you need to think about where to place the bracket:

Original location — If the glass is undamaged at the original mount point, this is the best choice. The mirror will be in the factory-intended position for optimal viewing angle
Adjacent location — If there are cracks near the original mount point, consider placing the bracket slightly to the side. A strong adhesive bond could actually help reinforce a cracked area, but it could also cause additional stress that makes the crack worse during temperature changes

In my case, there were four cracks meeting at the original mounting point (from previous damage). I decided to place the bracket back at the original location, betting that the strong adhesive would reinforce the area. It was a calculated risk, and so far it has held up.

Step 5: Apply the Adhesive

Cut or squeeze the adhesive tube according to the kit instructions. Apply a small amount of adhesive to the flat surface of the metal bracket. You do not need a lot — a thin, even layer about the size of a dime is sufficient. Too much adhesive will squeeze out from the edges and create a mess on the windshield.

Important safety note: The adhesive in rearview mirror kits is typically a strong chemical compound. Avoid skin contact and work in a well-ventilated area. If you get adhesive on your skin, wash immediately with soap and water.

Step 6: Press and Hold

Place the bracket firmly against the windshield at your chosen location. Press firmly and hold it in place for at least 60 seconds. Do not let go early, even if it feels like it has stuck. The adhesive needs this initial contact time to develop enough strength to hold the bracket in place.

During this 60 seconds, keep the bracket perfectly still. Any movement or shifting will break the forming bond and weaken the final result.

Step 7: Wait Before Reattaching the Mirror

After the initial 60-second hold, let the adhesive cure for the time specified in the kit instructions — usually at least 15 minutes, though overnight is better. The bracket may feel firmly attached after a few minutes, but the adhesive has not reached full strength yet.

Once fully cured, slide the mirror assembly back onto the bracket and tighten the setscrew. Adjust the mirror angle and you are done.

How Long Does the Repair Last?

A properly executed rearview mirror reattachment with the right adhesive can last for years. Many people report the repaired bond lasting longer than the original factory adhesive. The key factors for longevity are:

Clean surfaces — The number one reason for adhesive failure is contaminated bonding surfaces
Adequate cure time — Rushing the cure leads to a weaker bond
Correct adhesive — Using the purpose-built rearview mirror adhesive rather than generic glue

Worst Case Scenario

If the repair fails or if the windshield has too much existing damage, the next step is a full windshield replacement. That is a bigger expense, but the good news is that many insurance policies cover windshield replacement with no deductible or a very low deductible. Check your policy before paying out of pocket.

In the meantime, a $5 adhesive kit and 5 minutes of your time is a perfectly reasonable first attempt. If the windshield crack is the root cause of your problems, you might also want to review our windshield crack repair experiment to see whether a DIY crack fix is worth trying on your vehicle.

If you are getting comfortable with simple car repairs, there are several other maintenance tasks on this site that save you money. Check out our guide on replacing Dodge Caravan front brake pads or learn how to turn off the maintenance light on a Honda Accord — both are quick DIY jobs that cost a fraction of what a shop charges.