That Slime crap should not even be on the market for car tires. I had to deal with 4 tires once filled with it, and it goes everywhere when you break the beads. Water cleans it up the best off of the tires, and wheel, but when I did these it was -10 degrees outside. YUCK, and it won't fix a tire anyway.
And, in that tire repair video, it was a total train wreck in attempting to patch/plug a tire. There are several more steps to the process in the RMA procedure which you can look up. I've fixed hundreds of tires, and it is seldom easy. Try one at a 45+ degree angle with a worn off deck screw, or a bent nail. Good luck with that on the side of the road with a gummy worm plug kit. I hate fixing tires btw