Depends on how heavy and how fast you drive...If its a thunderstorm with buckets and pails of water splashing at you...even the wiper wont help you...

I cant tell or measure how heavy the rain is, but from my experience,if its raining cats and dogs, and if you can drive up to 90kmh on the highway and still feel safe, then yes, it will repel the rain away.

i bought from u the other day.
Tested and for my car need at least 80kmh for the rain to slide off.
Heavy rain need to use wiper ler . This is not a viper replacement. Safety first.

i got the product from this nice seller a couple of weeks ago (rainy week).

after i applied the product on to the car windows, it doesnt rain since then.

somehow, i tried to pour water to the car windows and i can see the water slide away from the glass quickly.

thumbs up product ~

Last Sunday COD with the seller in Kelana Jaya LRT station. Very nice seller sorry for being slightly later due to the traffic. Applied it on my windscreen and so far it works alright for me. Planning to get maybe a few more for my family use.