Actually fixing a crack in a garage door panel can be a difficult and even impossible task.
Garage door exterior surface cracked.
You are more apt to see these types of cracks on a garage floor that has a hard smooth troweled surface than one that has a broom finish.
Gravel and or sand on top of the sub grade.
The surface is also easy to clean but the door itself may break if you hit it with a car or tractor.
Cracking due to poor compaction of sub grade before pouring a concrete slab it is important to prepare what is often called the subgrade which usually involves compacting the sub grade and base i e.
Repairing the doors requires a little work and depending on how large the crack is could be.
Loss of caulk s initial adhesion and flexibility causing painted caulk to crack and or pull away.
Wooden door patch repair an old wooden garage door made of fiber board wood or other composite wood materials can become warp and receive water damage from years of rain and snow splashing and pelting its surface.
Caulk paint cracking or crawling the cracking of the paint film over a caulked area.