Not all sealants are the same. I used Continental sealant (water base, with my Nissan Leaf), and it worked exactly as described. Remove nail, fill tire to 40psi with sealant, drive 25-30mph to distribute evenly, stopped, looked at the hole, white sealant had come out and had dried up. Drove on the tire for a week (250 miles?), no air leakage. Took the wheel/tire to NTB (close by), they removed the tire, flushed it out with water, inspected TPMS, ALL GOOD, tire lasted another 5 k miles until an accident took it out.
HOWEVER, I've heard only negative things about sealant being used with the foam-lined tires (Tesla OEM Conti). The 5/8" thick foam can prevent the sealant from reaching the hole. In addition, the foam doesn't allow the sealant to distribute evenly, which can create balancing problems.
Hence the problem. I spoke at length with a serious car guy at my local Tesla SC, and he's been trying to find a donut spare for his BMWs for more than a decade. With the Tesla, the ONLY viable solution for driving outside Tesla service range is to carry a spare. (Yes, I know about Magic Spare, but it's almost full-size!)
I'm going to try to find someone who has, or can make, an adapter/spacer that would fit between Tesla hub and Mercedes/VAG wheel. I've located a couple of "young" used Vredestein Space Master spares from Audi or Mercedes. I might buy one and hope it will fit, with a spacer, and clear the caliper and fender opening.
What a royal PIA!!! Shame on the auto industry, eliminating the spare since how long...15, 16 years???