If you have leased your vehicle, cavities sealing and underbody protection do not matter much, because after a few years you usually return it and then rust is not an issue. But if bought with the intention to drive it for many years, it can be quite a topic. Almost all cars and probably e-cars are no exception, form rust in hidden places (in cavities, overwrought sheet metal parts, seams). Even garage vehicles make here no exception. It is logical that a cavity sealing and underbody protection protects better with not yet old vehicles than with old ones. But how does it look with e-cars, can you trust them without hesitation to such a specialized company? After all, he would have to know all the accesses to the hollow walls, so know where the rubber stoppers are located that have to be removed to insert the spray hoses and can also replace one if he takes damage while pulling out. But auc h other rusty places should be known and how to reach them, or how to dismantle what to get at them. If one really finds a company that gives the impression that everything is to be handled, what about the high-voltage battery and the many electronic parts that are hidden and could be hit by the spray jet???? And then the warranty question: What would Mercedes say if, during the warranty period, such a protected vehicle were to be used?? on the one hand, I would like to buy my EQE rust protection for many years, on the other hand, I don’t really believe that preservation workshops (such as those by Mike Sanders or similar products) are really familiar with e-cars, even if they don’t admit it openly. One would have to have a kind of explosion drawing from which all access points etc. can be seen. Trust him to such a workshop that has a good reputation for conventional cars?