The result you will have with a foam cannon depends on various factors. The main ones are:
1. The foam cannon itself
2. The shampoo used
3. The maximum operating pressure of the pressure washer.
This specific foam cannon is very good and has nothing to envy from others that cost almost twice as much. I highly recommend it, as long as you do the following:
When you receive it, you will see that it contains a small bag that, among other things, includes a thing like a nozzle, which is shown in the first photo (I didn't know what it was at first, as it was not mentioned anywhere in the instructions). As soon as I received it, I tried it and I have to say that I was disappointed. However, I started searching on the internet to see what could be wrong and I came across this video: [insert YouTube link here]
There, I understood the role of the extra nozzle. I followed the steps in the video and changed the nozzle to the smaller one (compared to the one it originally had). Now, with the smaller nozzle and (important note), by turning the regulator all the way to "-", it produces a very rich and thick foam that sticks to the car.
So, for perfect results, change the nozzle and turn the regulator all the way to "-".