What is the recommended spray pattern I should use with my ESS Sprayer?

Hold the Spraywand at right angles to the target surface. Starting at the highest point and using a zig-zag horizontal strokes about 1 meter wide, spray down to the lowest point. Try to have each stroke overlap the previous stroke by about 50%. You can use vertical strokes if it suits the area better. Just make sure to work in a methodical pattern and let your strokes overlap.