Love your vids! Keep it up. I've restored a couple of 12s as well and I don't know why, but those soles just eat up paint and won't let go. Super tough to remove, even if it's just a tiny spot. Once I saw, how much paint these obsidians had on 'em, I really cringed! :D:D But great job man.
I HATE when people try to paint the rubber soles it never sticks long term and looks so sloppy. Go on amazon and look up metal dental tools, they're less than $10 and make cleaning outsoles super easy. One of the best things i've bought for sneaker restorations. Scraper and dental pick.