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I used a PVC material on mine, because of the moisture issue.
I've never used the sealant on the kits, but you could try a test section on the back to see if it has any affect on the material. IMHO I would recommend both sides be done if you go ahead. I think the un-sealed side would have a tendency to "warp/expand" if un-treated.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.