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Black spots on the bottom or along the edge of your bathroom mirror are caused by oxidation behind the mirror glass. When moisture and air are trapped between the glass and the backing, they react and cause discoloration. This is sometimes referred to as “mirror rot.” You’ll need to separate the glass and the backing to fully remove it.

There’s no exact formula to calculate the cost of your mirror, but a few guidelines will help you estimate the price tag you can expect. The bigger the mirror, the higher the cost—and the same goes for thickness. Customizations will largely depend on the labor required, so think about how long your design will take and multiply that by your contractor’s hourly rate.

The methods outlined here are intended for surface scratches—ones that don’t cut into the glass very deeply. For deep scratches, you should consider a more comprehensive glass scratch repair kit. These kits come with abrasives, polishing compounds, and specialized tools designed for removing deep scratches from glass. If you feel uncomfortable tackling a deep scratch on your own, consider calling a local glass repair contractor.

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.