We also needed a way to lock the "trunk" with all our camping gear. So we started creating something that we could bolt from the inside, and deny access behind the seats. This is built out of marine grade ply; I wanted something that would hold up to the elements. The sheet cost me about $80, funny enough the wood shop guy was a Jeeper and he helped me get it back home, because it wouldn't fit in the Jeep (I didn't think that one through very well).
I initially was going to cover/seal it with epoxy, and boy was that a bad idea, and it was about an $80 mistake. I learned a lot though; like screw trying to cover anything with epoxy. So we sanded it down to even out the texture
Instead we went with this black enamel paint. That worked out real well and gave it a nice coating. We did about 3 applications on the top side. We were running super low on time and was only able to do the top side, so eventually we will get to the bottom, but for now the ply is holding up real well.
I added some window trim to the bottom so it wouldn't rattle against the back and also to help protect the paint
Here's a shot from the backseat
Andddddddd I forgot to take a final finished shot; I will take one soon and edit this post, and also how all the pieces came together.