My sealant sits in the basement, replaced by a puncture repair kit, the type with the sticky string and the tool to use it.
Larger problems may or may not be solved with a patch installed on the inside of the tire.
I would never use that kit, get an AAA membership and wait for them to get you out of trouble.
I laugh when I see these kits being sold on eBay, they can do more damage than good.