The most likely cause is the large spring(s) directly above the middle of the Garage Door are broken. If you look up at the spring(s) you will see a gap in the spring.
This depends on the age and the manufacturer of your Garage Door. The best thing to do is take a picture of the damage and email to: info@accessgaragedoors.ca . We will let you know if we can [...]
This depends on the amount of damage. The best thing to do is take a picture of the damage and email to: info@accessgaragedoors.ca . We will then let you know if we can repair the track on your [...]
Most definitely, each manufacturer has their own specifications which can be found on their websites. Most recommend the use of a high quality alkalyd latex exterior paint.