Wallpaper vs RV

Almot wrote:

Not sure what you mean by "outside walls". Nobody covers exterior wall outside with wallpaper. There is normally a 1/4" interior plywood panel (covered with wallpaper), then 1.5-1.75" void filled with insulation, then exterior aluminum or fiberglass siding (or a steel sheet in motorhome).

Presumably the meaning is "exterior walls," as opposed to "interior partitions." At least, that's what I took it to mean.

For a simple and inexpensive and likely long-lasting (but not necessarily beautiful) finish, a good latex exterior house paint, on top of a decent primer, would be pretty good. I've heard of people painting wooden boats with such paint and getting good service, no worse than expensive marine boat paints. The paint companies know that house paint is a good portion of their sales, and so put a fair bit of research and development into formulating good exterior paints that last well even under damp conditions.