Just bought the trailer with the door like this and wondering how to approach a fix. Thinking of taping off the white line then stripping and repainting below the line. Then remove blisters and spot paint the areas above the line.
First, seal the window frame and top of the door to stop the water leak that caused it. The entrance door and compartment doors on certain year Camplites are made by Challenger doors and had lauan plywood in them. That gets wet from leaks and corrodes the aluminum skin. The typical leak is at the bottom of the outside black plastic trim around the door window. There is a small joint there that lets water inside the door. I used clear silicone on the crack after a good cleaning. Once the door no longer leaks it will take weeks, if ever, to dry out even in the hot sun. Once dry, a light sanding and spray painting the door is one possibility. Others on here have replaced the door, but that's expensive. It is a standard size RV door, so do some on-line shopping for a good price.
Edit; on my compartment doors, removing the blisters left holes in the aluminum skin, so I replaced all 3 doors. .
Honestly IMO you wont be happy with any fix other than replacing the door. I had this issue on a compartment door and had it professionally repaired with bondo and repainted. That "fix" lasted 2 months and the bubbling reappeared. Once the water gets inside of the door. coupled with the garbage Luan, it is game over. Why in the world Challenger thought Luan was a good material to use in a door is a mystery to me. Just sharing the reality with you so you are fully aware of the risk of throwing time and money at any kind of repair rather than replacement....
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I also agree with the previous comments regarding your damaged door.
A tip that a lot of original owners have done to avoid similar issues with your compartment doors is to drill a couple of small drainage holes in the bottom edges of each door. Let's any water out if it penetrates around the perimeter and might help keep the inside materials dry.
I tried drilling drainage holes at the bottom of the bubbling compartment door that I referred to in my comments above. Didn't work. Once that bubbling occurs your options are limited, from my experience.
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