Repairing 50 year old paper board for storage cabinet wall

Its old paper board, I thought let me see if I can fix it and make it better than new.
I used a sander, FG yellow drywall tape, old Behr flat latex paint.
This is a very thin board, less than 1/4 inch and even had a crack where steel nails were holding it to the wood frames. All the steel nails were rusted away, so the board was loose in a bow storage locker under the V berth. The board keeps things from falling in between the frame into the bilge. the plywood floor edge of this storage locker runs into the frames leaving a gap.

Paint is adhesive enough and fairly water proof, and the FG tape gives the old paper board strength. Its in a gallery, so if you click on the images, you can read descriptions.
For flattening the curl I laid lead weights on the edge. The curl showed up after one side had dried. So the other side down, the board stresses will be equalized. I wont nail it on, I will use SS screws. And I got one more board on other side of locker to do.

It worked out pretty good for not a lot of money.