Here's the old fashioned way to prepare a cake pan, (instead of spray.) Dip your fingers into the solid shortening and get some. Spread it with your fingers over the pan bottoms and sides until it is spread evenly and thoroughly covers. Get addtional shortening in your hands and continue with both pans. I recommend trying to enjoy this. Kids love this kind of this for good reason; it's fun.
Now spoon a little all purpose flour into each pan. Hold the pan upright, shaking it and tapping it with my right palm. Rotate the pan moving the loose flour until there is some flour stuck to all surfaces. If any loose flour remains in the pan, pour it into the next and continue with the same procedure in the next pan. When the final pan is coated, dump any remaining flour into the sink with the garbage disposal.