This idea comes from our friend Ashley Poskin. "After using the 'watercolor' process on my daughter's birthday cake this year, I thought I'd see how well the process would transfer over to paint—it is, after all, named after a painting technique," she explains. The cake decorating technique starts with a frosted cake with multiple colors piped onto the sides in artistic placement; it's placed atop a turntable and a bench scraper is used to gently marbleize all of the colors together, smoothing out the frosting into a beautiful blend.
For this tutorial, we sourced a cement planter that would resemble a stacked layer cake once painted in white. Choose a quality primer that is thick and won't drip, plus gel medium and a cake scraper. Once mixed into the craft paint, the gel medium takes on a consistency similar to frosting, which allows the process to work. If you don't use the gel medium you can still achieve similar results, however your paint will be more prone to drips and you won't get the same delicious texture.