The inside of my stalls are 2"x6" yellow pine planks installed horizontally. I used spar urethane, cut with something to make it a tad bit thinner (turpentine? paint thinner?). Did this in my tack room, then hired some guys to complete the entire barn interior (where I had planks), since it ended up being too big a job for me
![Shocked :shock:](./images/smilies/icon_eek.gif)
It looks great and cleans up with some soapy water and elbow grease.
My entire exterior barn is metal, but on the barn wall that communicates with the turnout pen, DH ran a length of 2x4 horizontally the length of that particular exterior wall (about 4' above the ground). He ran another 2x4 along the lower edge of the wall (we are on a concrete slab), screwing through the metal to attach these 2x4 sections to the barn's frame. Then we took heavy duty stall mats and attached them with screws & washers to the 2x4's to make a "padded" wall, so my gelding couldn't kick the metal wall. Has worked perfectly. Someone in the future could remove the stall mats if they wanted.
For the posts that hold up the turnout pen "porch roof", I had to wrap them in 4' tall field fence, since, yes, the boys sometimes wanted to use them for dental floss
My barn is raised center aisle and the stalls open both into the barn aisle (slider) and into the turnout pens (Dutch door). The one time that I had a horrible catastrophic death (in less than 2 minutes), the poor horse went down in the turnout pen, where the gate to the pasture is 10' wide, so I did not have to disassemble anything. Not sure what will happen if my oldster goes to sleep inside his stall.