Before and after effect is incredible! Before treatment, the paint is rough, you can feel when you go over it with your hand, as it "scrapes". After treatment with clay bar the paint is smooth as a baby butt! It scratches nothing more, and I think the paint gleams after something more. It should be noted that it is a film of water between clay and paint must always be present, otherwise the clay remains the paint stick. However, it is a good description in the box there. After Abkneten still polishing and waxing, and the car looks like new!