The one that he uses last is going to work the best cuz it's already going to have three or four different paint already soaked in he should have put all four different paints on four different parts and let it all dry then wiped it off to see the better results
I think he's not leaving the paint on long enough to let it dry spraying the liquid breaking down the effect also the ingredients that's in the Windex there's two different kinds of Windex I wouldn't have used either