These paints dry so fast that it works better to load 2 different color paints onto a foam brush then drag it across the ceiling. If I want to blend further than that then I'm putting just retarder on a clean foam brush and lightly dragging this across the area.
( Pushing down will just lift the paint back off)
Still gotta put the streaks through it to make it look tie-dye. It may not look 13ft x 13ft, but it is.