We researched and compared the top glues for repairing plastic car mirrors, evaluating manufacturer specifications, industry standards, and aggregated owner feedback. Our guide covers adhesives for different plastic types, including ABS, acrylic, and polycarbonate, as well as mirrors with heating elements. We considered bond strength, cure time, temperature resistance, and ease of use. Below are our picks, with honest assessments of each product’s strengths and weaknesses.
| Photo | Product | Score | Buy |
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3M DP420 Epoxy Adhesive Best Overall Dual-cure epoxy, 20-minute work time, full cure in 24 hours |
9.0 | 🛒 Check Price |
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Loctite Plastic Bonder Best for Quick Repairs Cyanoacrylate gel, sets in 30 seconds, full cure in 24 hours |
8.7 | 🛒 Check Price |
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Gorilla Epoxy Best Value Two-part epoxy, 5-minute set time, full cure in 1 hour |
8.4 | 🛒 Check Price |
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J-B Weld PlasticWeld Best for Heavy Duty Two-part epoxy putty, sets in 5 minutes, cures in 1 hour |
8.1 | 🛒 Check Price |
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Permatex Plastic Repair Kit Best for Mirror Housing Two-part cyanoacrylate with primer, sets in 30 seconds |
7.8 | 🛒 Check Price |
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Devcon Plastic Welder Best for Polypropylene Two-part acrylic adhesive, 15-minute work time, full cure in 24 hours |
7.5 | 🛒 Check Price |
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E6000 Craft Adhesive Best Flexible Bond Industrial strength silicone, 24-hour cure, remains flexible |
7.2 | 🛒 Check Price |
1. 3M DP420 Epoxy Adhesive: Best Overall
The 3M DP420 is a two-part epoxy that delivers an exceptionally strong bond on a variety of plastics commonly used in car mirrors, including ABS and polycarbonate. Based on owner feedback and the spec sheet, it offers high shear strength and excellent temperature resistance, making it suitable for exterior mirrors exposed to sun and cold. The 20-minute work time gives you enough time to position the mirror precisely before the adhesive sets.
However, this product is not ideal for quick fixes. It requires a dual-syringe applicator and clamping during cure, which may be inconvenient for some. Additionally, the full cure takes 24 hours, so you cannot use the mirror immediately. Skip this if you need a fast repair or do not have clamping tools.
- Excellent bond strength on ABS, polycarbonate, and acrylic plastics
- Withstands temperature extremes from -40°F to 250°F
- Gap-filling formula works even on uneven mirror backing surfaces
Pros: Extremely strong and durable bond; Resistant to vibration and road shock
Cons: Requires a dual-syringe applicator (not included with all kits); Long cure time may require clamping
2. Loctite Plastic Bonder: Best for Quick Repairs
Loctite Plastic Bonder is a cyanoacrylate gel that bonds quickly and works on many plastics, including the tricky polypropylene and polyethylene often found in mirror housings. According to manufacturer specs and user reviews, it sets in 30 seconds when used with the included activator, making it ideal for quick repairs. The gel formula stays in place without running, which helps avoid mess on the mirror surface.
However, the bond strength is not as high as two-part epoxies, especially under continuous vibration or extreme temperatures. Some owners reported failure after a few months on side mirrors. We recommend this for temporary fixes or low-stress applications. Skip this if you need a permanent repair on a frequently adjusted mirror.
- Works on polypropylene, polyethylene, ABS, and other plastics
- Gel formula resists dripping and fills small gaps
- Includes surface activator for difficult plastics
Pros: Very fast setting (30 seconds) with activator; Easy to apply with precision tip
Cons: Bond is less durable than epoxy for high-stress areas; Not recommended for mirrors with heating elements
3. Gorilla Epoxy: Best Value
Gorilla Epoxy is a popular two-part epoxy that offers a good balance of strength and speed. It sets in 5 minutes and fully cures in 1 hour, which is faster than many epoxies. Based on owner feedback, it works well on ABS plastic mirror housings and provides a waterproof bond that holds up to rain and car washes. The gap-filling ability helps when the mirror backing is slightly warped.
However, some users noted that the epoxy can become brittle over time, especially in cold climates. It also tends to yellow when exposed to direct sunlight, which may be visible if the glue seeps out from behind the mirror. Skip this if your mirror is made of polypropylene or if the repair area is highly visible.
- Bonds to plastic, metal, glass, and rubber
- Waterproof and weatherproof once cured
- Gap-filling up to 1/4 inch
Pros: Fast cure time (1 hour full cure); Good value for the price
Cons: Can yellow over time with UV exposure; Not as strong on polypropylene as on ABS
4. J-B Weld PlasticWeld: Best for Heavy Duty
J-B Weld PlasticWeld is a two-part epoxy putty that cures to a hard, machinable plastic. It is designed for structural repairs and can be used to rebuild broken mirror mounting tabs or fill cracks. According to the manufacturer, it bonds to polypropylene, ABS, and other plastics, and once cured, it can be drilled and sanded like original plastic. Owners report that it holds up well under vibration and temperature changes.
However, the putty consistency can be tricky to mix thoroughly, and it sets quickly, leaving little working time. It also requires clean, roughened surfaces for optimal adhesion. This product is best for experienced DIYers. Skip this if you prefer a liquid adhesive or need a quick, clean application.
- Can be drilled and sanded after curing
- Withstands temperatures up to 250°F
- Works on polypropylene, ABS, and fiberglass
Pros: Extremely strong and durable bond; Can fill large gaps and rebuild missing plastic
Cons: Mixing and application can be messy; Requires good surface preparation for best results
5. Permatex Plastic Repair Kit: Best for Mirror Housing
Permatex Plastic Repair Kit is a cyanoacrylate system that includes a surface primer and adhesive. It is formulated for automotive plastics like those used in mirror housings. Based on user feedback, it works well for small cracks and reattaching mirror glass to the backing plate. The clear formula dries transparent, which helps maintain the appearance of the mirror.
However, this adhesive is not suitable for large gaps or areas subject to heavy stress. Some owners reported that the bond failed in very cold weather. It is best for minor repairs where appearance matters. Skip this if you need to repair a broken mirror mounting bracket or if the mirror is exposed to extreme temperatures.
- Specifically designed for automotive plastics
- Includes primer for hard-to-bond plastics
- Clear formula for invisible repairs
Pros: Fast setting and easy to use; Primer improves adhesion on difficult plastics
Cons: Not as strong as epoxy for load-bearing repairs; Brittle under extreme cold
6. Devcon Plastic Welder: Best for Polypropylene
Devcon Plastic Welder is an acrylic adhesive specifically formulated to bond polypropylene and polyethylene, which are notoriously difficult to glue. According to the manufacturer, it provides high peel and impact strength, making it suitable for mirror housings made from these materials. Owner reviews indicate that it holds up well in automotive environments, resisting vibration and temperature swings.
However, this adhesive is pricier than most, and it has a strong chemical smell that requires ventilation. The 15-minute work time is moderate, but the full cure takes 24 hours. It is also less effective on ABS and polycarbonate. Skip this if your mirror is not made of polypropylene or if you are sensitive to strong odors.
- Bonds polypropylene and polyethylene without special primer
- High impact and peel strength
- Withstands temperatures up to 200°F
Pros: Excellent adhesion to low-energy plastics; Good impact resistance
Cons: Expensive compared to other options; Strong odor during application
7. E6000 Craft Adhesive: Best Flexible Bond
E6000 is an industrial-strength adhesive that cures to a flexible, rubbery bond. It is often used for crafts but also works for automotive applications where vibration damping is needed. Based on user feedback, it can be used to reattach mirror glass or repair minor housing cracks. The flexibility helps prevent the bond from cracking due to road vibration or temperature changes.
However, E6000 is not a high-strength structural adhesive. It is not suitable for load-bearing repairs like mirror brackets. The cure time is long (24 hours minimum), and the bond may not hold up under extreme heat. Skip this if you need a rigid, high-strength repair or if you cannot wait a full day for the glue to set.
- Bonds plastic, metal, glass, and rubber
- Remains flexible after curing
- Waterproof and weather resistant
Pros: Flexible bond absorbs vibration; Easy to apply from tube
Cons: Long cure time (24-72 hours); Not as strong as epoxy for rigid repairs
Frequently Asked Questions
Can I use super glue on my car mirror?
Standard super glue (cyanoacrylate) can work for small plastic mirror repairs, but it may not hold up to vibration, temperature changes, or UV exposure. It is best for temporary fixes. For a durable repair, use a plastic-specific epoxy or adhesive designed for automotive use.
What type of plastic is my car mirror made of?
Most car mirror housings are made from ABS, polypropylene, or polycarbonate. The mirror backing plate is often ABS or a similar plastic. Check the owner’s manual or look for recycling symbols on the part. If unsure, choose an adhesive that bonds to multiple plastics.
How do I prepare the plastic surface before gluing?
Clean the area with isopropyl alcohol to remove dirt and grease. Lightly sand the surface with fine-grit sandpaper to create a rough texture for better adhesion. For polypropylene, use a plastic primer or a specialized adhesive like Devcon Plastic Welder.
Will the glue damage the mirror heating element?
Some adhesives can conduct heat or damage the heating element. Use a non-conductive epoxy like 3M DP420 or a silicone-based adhesive like E6000. Avoid cyanoacrylates that may seep into the element. Allow the glue to cure fully before using the mirror heater.
How long does it take for mirror glue to cure?
Cure times vary: cyanoacrylates set in seconds but take 24 hours for full strength. Epoxies set in 5-20 minutes and cure in 1-24 hours. Always follow the manufacturer’s instructions. Avoid moving the mirror during cure to ensure a strong bond.
Our Verdict
After researching and comparing these products based on manufacturer specs and owner feedback, our top pick is the 3M DP420 Epoxy Adhesive for its exceptional strength and durability on plastic mirrors. For a quick repair, the Loctite Plastic Bonder is a solid runner-up, offering fast setting and ease of use. Choose based on your specific mirror plastic and repair needs.
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