LOL, I grew up on a farm so I'm a jack of all trades. I know how to weld, do mechanic work, and all that crap. I'm only license to to be a sparky. My dad and both grandpas were grease monkeys.
Sorry I worked construction since I was 16, I jumped from being an idiot when I was 18 to getting my electrical license in my state. I'm 41 now and been around the building trades for a minute. Not sure where you are because you didn't fill out your location in your profile but I still say don't...
Painting it will make it last a year or two longer but I still suggest only using it inside. It's not rated for exterior use at all. Around here it gets so humid in the summer the stuff flakes apart even if covered.
That OSB in the first picture will flake apart once it gets wet. It has to be covered when used in construction. Honestly I don't care for it and don't use it in anything I build.