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Garage door insulation can last anywhere from 20 to 100 years depending on the type of insulation. Cellulose has the shortest lifespan coming in at between 20 and 30 years, while spray foam, mineral wool, and fiberglass can last between 80 and 100 years with proper maintenance. 

Humidity plays a role in how long more susceptible insulation materials—like fiberglass—last. Once fiberglass batts reach the 15-year mark, you'll need to routinely inspect your insulation to ensure that it is in mint order.

The best options for lubricating a garage door are silicone- or lithium-based lubricants made specifically for this purpose. These products are designed to deeply penetrate the door's components, such as hinges and springs, providing long-lasting protection against wear and tear. A silicone-based lubricant is an excellent choice as it also prevents rust and corrosion and performs well in extreme heat and cold.

It is important to avoid certain products. Do not use heavy, oil-based lubricants or standard grease, as they can attract dust, dirt, and other debris that may get caught in the tracks. You should also avoid using WD-40, as it can strip away any existing lubrication.

You can typically find appropriate garage door lubricants online or at a local hardware store for less than $10.

The best method for painting a garage door depends on the door's design and the finish you want to achieve. For the most professional-looking finish, especially on doors with panels or intricate details, a paint sprayer is an excellent choice. It can easily get into hard-to-reach places and provide a smooth, even coat.

If you don't have a sprayer, or if your door is flat, a combination of a roller and a brush is the most effective approach. Use a roller for the large, flat sections to cover the area quickly and efficiently. For the best results, experts recommend a roller with a nap between ⅜ and ¾ inches thick; natural fibers can also help ensure an even coat.

A brush is essential for handling the finer details. Use it to paint grooves, angles, small panels, and the edges of the door where you need more control.

Regardless of the tools you use, it's a good idea to step back after the main application to review your work and use a detail brush to touch up any missed spots.

The life span of a newly painted garage door depends on the quality of your paint, the material of the door, and the climate you live in. If you’re confident that you’ll maintain the door as best you can, you can expect the job to last between 5 and 10 years.