The instruction guide is minimal. You have to figure things out yourself. I used it once as a foam sprayer. I used Meguiars gold class shampoo diluted to 1:5 ration. The foam came out ok. But you have to run a couple of run to get a satisfactory foam coverage. When you press the button, nothing happens. You have to wait awhile and press again before foam comes out. Pressing the button twice gives you continuous spray without holding the button. I had it working correctly once. Then I am not able to get that function working. I have to keep pressing the button to have foam come out. There is no leaking. The performance is not consistent. I will go back to my old foam gun.