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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.

In addition to being less expensive, nylon garage door rollers are actually much quieter than steel rollers. However, many homeowners find that they wear out prematurely compared to steel. In general, more expensive steel rollers are more durable. However, their nosiness can make them less than ideal for garages that are located beneath a home's bedrooms.

The cost to paint a garage door is usually $1 to $4 per square foot, which translates to around $120 to $500 for the average two-car garage door. This relatively low-cost painting project can greatly impact your home’s look and curb appeal, and you can save a good deal of money by doing it yourself.

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.