It's true v-kool's tint film consist of many layers and one of the layer are made of some metal particles which is why it is still the highest heat rejection tint film to date. Forget about the percentage of heat rejection those shops claim their tint to have coz the real heat rejection is always lower than what they claimed. Heck, even V-kool elite with 93% claimed heat rejection is tested to be around 80+% in reality. So imagine if those other tint brand that claim their heat rejection are lower than that. About v-kool will rust in the long run is true if the person who tint it didnt apply some kind of "oil" to the tint where they cut from the whole roll of v-kool tint. Try to enquire from those authorized v-kool tint shop or the HQ themself.

I dont think so, tested on machine, v-kool elite heat rejection is highest to date but i dont deny that 3M is not bad too.