What to do if there are watermarks after applying Crystal 70?

[RebeccaAnn]

Crystal 70 may have watermarks after application, you can try wiping it with alcohol. Details about Crystal 70 are as follows: The M Crystal 70 series car film is a high-end model: It has a light transmittance of over 70% (actually 71%), with excellent clarity. It uses 3M's exclusive patented multi-layer ceramic optical film substrate, with a thin thickness composed of over 200 layers of optical micro-coatings. Each layer selectively refracts and reflects the sunlight, achieving a maximum heat insulation rate of nearly 60%. Heat insulation rate: The reflection of Crystal 70 is achieved through refraction and reflection, so it is related to the angle of sunlight incidence and is not a fixed value. Actual tests show that when the car window is exposed to direct sunlight and oblique sunlight, the heat insulation rates differ. The heat insulation rate is highest under oblique sunlight, reaching up to 59% for the front windshield, while under direct sunlight, it is only 50%. Of course, this performance is already very high, as mid-range products generally have a heat insulation rate of around 35%. Increasing the heat insulation rate by even one percentage point is very challenging. The higher the rate, the more demanding the requirements become.