Well...I needed to protect the insulation. After construction was complete, the interior took on a life of it's own...with the help of my wife...who LOVES
me having a shop, and loves decor... LOL (probably to keep me out of the house). The exterior is heavy 16ga black corrugated allowed to rust with the intention of having it look like a machine shop at an old mine here in the west...and blend into the landscape.
Interior is 20ga. black (no galv. finish) sheet metal, 4'x10'. I washed off the mill oil with purple de-greaser then layed out all the sheets flat in the sun and sprayed diluted pool acid on them with a bug sprayer to start the rusting process. I repeated the process for about a week until I got the level of rust I was after. I then stopped the process with a solution of baking soda and rinsed well. We then mounted them on the studs and rolled on clear urethane to seal them up.
We also did the restroom but also used extra corrugated. What a pain essentially wallpapering with sheet metal.
The wood is white pine T&G. That trick is take white vinegar and water 50/50 and throw in a steel wool for a few days. Strain the mixture through a paint strainer and spray it on the installed wood with a tank sprayer. It instantly ages the wood to look old in minutes.
Along with being a full function shop on the ranch and not just a man cave, my wife decided to go with a Harley theme. It's painted Harley orange and black. The floor is industrial epoxy with HD orange/black flakes with a gloss top seal.
She also re-purposed an old bus seat in HD for my birthday!
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