You know , if you’re ROUGH on all your personal possessions , or have young kids

, then you need to cover the inside foam some kind of way .... I used common (used ) bedsheets on the inside of my Foamie #1 ( now “nookery” ) and that was fine and a reasonably durable surface ... However , if you are a gentle sort and easy on your possessions , you “Could” (possibly) just paint the bare foam or leave it as it is ...

We had a little foam sailboat a long time ago ( I know we’ve told this story before

) , and it had a plain foam inside ( where you sat) , and sure it got dented up and scraped a bit , but after years of use , it wasn’t “bad” ...we bought it used , and used it for several years , sold it for what we bought it for ... Unless somebody intentionally broke it, it’s probably still around somewhere...
And another fact , common Latex paint hardens the foam surface a bit ( after 2 weeks cure) , so it’s safe to say , painted foam is more durable than unpainted ... just a little bit more ... sometimes that can be enough ...
WE like to remind ourselves , “it’s just Foam” ... The reason I advocate going with as much foam as possible ... Cheaper , lighter, less labor, simple to repair ... and way less EXPENSE down the road (long term ownership) ... If it gets dented , so what ,
it’s just a simple camper , not a huge ( continuing) investment like an RV trailer ( or Yeti cooler

) ....
Or as my sarcastic hipster friends like to call it , the "Stay Free Mini Pad "...

....
