One, are these any sort of approved by DOT or TUV? If not then they’re basically illegal to use on your car. Go nuts on your off-road stuff and wheelbarrow.
Two, don’t buy these unless you have special equipment.
To utilize a tire patch you need to remove your tire from the wheel, clean and rough the area with a grinder, while also smoothing any ridges or anything. Then you use the scraper included. After which you need to clean the inside of the tire with a cleaning and prep compound, and after that apply a special glue just for tires. After letting it cure, then you can apply the patch, and roll it into the glue pretty hard. Like, really press into it. After you roll it all over you walk away for ten minutes, then put your tire back on, and put air in it.