I recently built my first model in 20 years and after airbrushing the basecoat of dark yellow and the olive green camo on my German 88mm gun. I mixed up a wash of raw umber and 50/50 isopropyl and brushed the model with it. Instead of the color building up in the bottom and edges of features, it built up around the edges of the puddles. I am using acrylic paints. Tamiya for the base coat and the wash was model master raw umber. What did I do wrong?
Jeff