Step 1: Measure 1” away from the center seam on both sides of the hat. Make sure you measure underneath the bill and the back of the hat so that the stripe extends as far as the eye can see.

Step 2: Tape it off. Since the hat is round, cut notches in the tape so it will stay in a straight line around the curves (this is very important!). Make sure the adhesive is firmly stuck to the surface of the hat before moving on.

Step 3: Using your sponge brush, paint on the primer—it gives the hat a rubbery, nonporous texture, which takes paint really well.

Step 4: Blend the paint colors of your choice in a cup until you get the shade you’re going for. (Here, Allison mixed white, teal green and hunter green.)

Step 5: Paint! Then, let dry, preferably overnight.

Step 6: When you’re sure that it’s completely dry, gently peel the tape off.

Hat’s off! The finished product.

D.I.Y. obsessed like Allison? Check out one of her favorite sites, Design Sponge, for more inspiration.