Aside from removing the undercoating from the door skin, I removed as much rust as I could from both the inner and outer skins. Then I sprayed the panels down with some rust Mort. After letting that do its thing, I wiped the panels down with some soap and water to neutralize the product.
Removing rust from inner skin
![Name: CC414809-C102-430B-8A51-9F811E54720B.jpg
Views: 1553
Size: 51.8 KB](https://67-72chevytrucks.com/vboard/attachment.php?attachmentid=1874809&d=1549953954)
Sprayed inner panel with rust mort
![Name: 5C73A8F5-5AAB-47B6-BD4F-8508A9C8840D.jpg
Views: 1507
Size: 54.9 KB](https://67-72chevytrucks.com/vboard/attachment.php?attachmentid=1874810&d=1549953954)
Removed and patched the lower corner on the outer skin that was rusted through
![Name: 83CE67AC-6BE7-44A2-B349-68D8346B8CB3.jpg
Views: 1517
Size: 42.3 KB](https://67-72chevytrucks.com/vboard/attachment.php?attachmentid=1874811&d=1549953954)
Both the inner and outer skins after applying the rust mort. I really like that product.
![Name: 5A235DB9-D5CF-477E-811B-C3503019526B.jpg
Views: 1533
Size: 54.4 KB](https://67-72chevytrucks.com/vboard/attachment.php?attachmentid=1874812&d=1549954004)
And just to be sure I won't have any future rust issues with the door, I gave it a real good coating of Por15.