In separate cups, mix Flag Red, Jack-O-Lantern, Bright Yellow, New Shamrock, Bimini Blue, Bright Blue and Purple Iris with Apple Barrel Pouring Medium. It should be a 2:1 ratio of paint to pouring medium.
In a rainbow sequence, directly pour your paint mixtures on to the pumpkin. Don't twilt or swirl your pumpkin. Pour at the top and let it run down the base of your pumpkin. Let dry.