Why does rainwater on new cars not dry easily?
2 Answers
Rainwater on new cars does not dry easily because new cars often have a layer of anti-corrosion oil. Below is a related introduction to the waterproof rating of cars: Meaning: Taking IP54 as an example for the car waterproof rating index, IP refers to the protection safety level. The first digit after IP represents the solid-state protection level, and the second digit represents the liquid protection level. Current status: Currently, most electric vehicles in China can achieve a protection level of IP67, with some new energy models capable of reaching an actual wading height of 70mm. The maximum upper limit of wading ability can even approach a height of 1 meter.
As a seasoned driver with years of experience, I've noticed that rainwater dries slowly on new cars primarily because the fresh paint coating is too smooth and intact. The water doesn't spread out but instead forms small droplets, which evaporate slowly and cling tightly. This is especially true when parked in shady or high-humidity areas with poor air circulation, unlike my old car with its fine scratches and oxidized surface that allow water to disperse and evaporate quickly. New car owners should be careful not to use highly alkaline car wash detergents that could damage the coating, as this would affect its water-repellent properties. The car's color also plays a role—darker colors absorb heat faster and might dry slightly quicker, but it's still slow. The best solutions are to park in a sunny spot after rain or manually dry the car. Over time, as the paint ages, this phenomenon will lessen, but patience is key in the early stages.
