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For small cracks, glass-bonding glue that can be pressed into cracks may be able to save a broken mirror. If a corner of a mirror has been chipped, you may be able to conceal the fact by adding a border or frame to the mirror. Deeper cracks and chips should be addressed by a glass-restoration professional if you're trying to preserve an antique or heirloom mirror.

Bathroom mirrors weigh between 6 and 13 pounds, depending on the size. A 16x20-inch mirror weighs 6 pounds, while a 24x36-inch bathroom mirror weighs 12.5 pounds. Large mirrors, such as a 30x40-inch mirror, weigh 46 pounds. When installing or hanging a bathroom mirror, have a neighbor or partner assist you in lifting and holding the mirror in place. A second set of eyes can also help ensure the mirror is centered and level. 

Yes, it is possible to repair a damaged or cracked mirror, but whether you should do it yourself depends on the extent of the damage. For minor issues like small chips, cracks, and scratches, you can use a DIY approach. Resin-based repair kits can fix minor cracks, while scratches can often be removed with metal polish, nail polish, baking soda, or a glass polisher. Always follow the manufacturer’s instructions for the best results.

However, for more significant damage, DIY repair is not recommended. Repairing and resilvering mirrors is a delicate process that can involve caustic chemicals and requires a high level of precision. The materials for a DIY attempt can cost over $100, which may not be a significant saving compared to hiring a professional. Since a failed attempt could result in more damage and higher repair costs, it is often better to hire a mirror repair expert from the start, especially for large, valuable, or extensively damaged mirrors.

The average mirror has a lifespan of 10 to 15 years. After that, the coating begins to deteriorate, losing its reflective properties. Acrylic mirrors have a slightly shorter lifespan of seven to 10 years. Higher-quality acrylic sheets with UV-resistant properties have lifespans similar to those of your average mirror. By maintaining your mirrors and keeping them out of direct sunlight when not in use, you can extend their lifespan. Some mirrors can last for decades.