How do you fix a dent on an aluminum garage door?

Answer 1

Bostonian has a good idea, I might add depending on the dent size you might try a plumbers helper, you know one of those plungers. Stick it over the dent give it a spray, the suction just might work,

I mention this just in case the dent isn't accessible from the back side.

Answer 2

Bondo works but takes a bit of effort to look good. Normal tin-knocking techniques don't work very well on aluminum since it stretches so easily.

Here's one that might work though. Get a can of "canned air" for blowing out dust from computers and electronic equipment. Use gloves and a face shield to protect your skin and eyes. Turn the can upside-down and spray the center of the dent. The "air" is actually a liquid under pressure that freezes at room temperature. This will cause the aluminum to shrink and may pop it back into its original shape. Apply a bit of the "air" and tap the dent lightly from the back. Repeat until it's back in shape.

Answer 3

You can use auto body filler and fix it just like body work on a car. Pretty easy, but will need to be primed and painted after.

Answer 4

use a rubber mallet to pound it out.

Answer 5

use a rubber mallet and bang it out