I use this product on a two-seater hood, but when I bought it, it was sold together with the fabric cleaner. The instructions said to clean the hood first and then apply the waterproofing. It lasted for six months. It is worth noting that I have a closed parking area, so I only noticed it when it rained on the road or when I washed it.

I wore the hood on my smart car last week with two good hands, but today when it's raining, I realized it's like I haven't worn anything at all! It's not worth my effort for nothing

I don't know if there was a mistake in application, but since it is not stated on the bottle, I did the process on a dry roof. I applied 2 good coats (half a bottle) and the car stayed dry for 6 hours. Today it randomly rained and the result was as if I hadn't applied anything at all. Theoretically, it should dry in 20 minutes. Truly a very bad product...

I am coming back after a few additional tests on the car. In the end, it didn't adhere well, resulting in some areas where it's as if I never applied it, while in others it does provide good hydrophobicity. In short, you need one bottle for one use. It is a very economical product, so it's not an issue as long as it gets the job done. It just requires A LOT of coats to adhere well.

Very powerful. I bought it to waterproof the car hood. Be careful not to run it on the windows or car body, it is very difficult to remove afterwards.

It's worth its money. Easy to use. Good results in waterproofing. Sufficient for 4 hands in an Audi A4