Originally Posted by 52Carl
While it looks like the area would be easy to patch, the outer door skin wraps around that rusty inner door skin, trapping water/rust.
To repair that area properly, you need to pry the folded over outer skin and remove about 2 inches of the inner skin.
Once you get done with that, you will be able to witness the condition of the outer skin in that area.

Any tricks for getting that seam unfolded without making a complete mess of it?