Naked eyes are not able to distinguish. It mainly depends on the credibility and reputation of the business to determine whether it can have dealership of 3M. 3M automotive film produced the first thermal insulation and explosion-proof membrane in the world in 1966. It is a producer that can individually produce explosion-proof heat insulation membrane from beginning to end and currently owns multiterm patented technologies of thermal insulation and explosion-proof membrane, owns multiterm global patent in the field of optical technology, produces more than 3 kinds of new heat insulation membrane products per year on average. Each patented technology bestows heat-insulating film to different special function, such as 3M smart heat insulation membrane technology of professional anti-eavesdrop.
The truth and falsehood of film can't be distinguished intuitively. The easiest method to distinguish false film is to smell the smell of the glue of film. The glue used in false film is smelly. If you want to stick 3M film, you might as well go to 3M authorized construction professional shop and ask the shop for 3M commitment card of compensation to sign with the merchant. Later, the merchant will give you an electronic newspaper card that will be sent to your home. False film will bot be found through this process.
