Sealant-based solutions like spays or comfort kits are OK (easy to use and cheap) but have some cons.
Let me explain.
1. After applying the spray or kit, you have to drive to a tire service anyway. There you pay for a regular wheel repair/balancing and also for washing the whole tire, rim and TPMS off that sticky shit that the sealants always turns into.
2. If your wheel is big (say, a fancy 20-21" of 285-295). The sprays have indication like "tire width up to... " so one spray may not be enough. You need to watch, is the spray fresh or not, it might be old (also the kit).
3. Besides damaging a rubber tire, a pothole can damage your rim, here any glues and kits don't work at all.
4. For both spray and comfort kit - you never know how big is the puncture. You may face a big sidewall hole, so what's next? Good if you have been driven by LA area, not the Nevada State Highway 50.
Conclusion: use whatever makes you feeling safe )) But going to long distance, better borrow the OEM space saver from another smart BMW buddy)
