I got the pictures from online coloring pages and then printed them bigger. Minnie's head is actually Mickey's flipped and I found a bow on a picture of Minnie and cut it out and added eyelashes. I used tracing paper for fabrics and a tracing wheel to transfer the design. The traced lines washed out when I washed the shirts.
I actually used school glue but I think the paste might have worked better. Since the glue tends to spread when you use more than a line, I used a paintbrush to do the ears, eyes, nose and mouth.
I let the glue totally dry for a day but when we spray painted the shirts we put lots of paint on and when the glue got wet again, it started to run. Because of that, some paint bled into the white area. I thought about using a bleach pen to whiten it up but the hubby and kids really like them the way they are so I'll leave it alone.
I waited 3 days before I washed the shirts. I washed them a couple of times in cold wather with lots of water and woolite to get all the glue out.