How iPad Fingerpainting Turned This Mercedes Into A Work Of Art By Nicole Martinelli • 9:46 am, May 29, 2012 NewsTop stories The fingerpainted car on display at Expo Arte in Italy. Courtesy Matthew Watkins. The signature of the artist on the customized skin. Courtesy Matthew Watkins. iPad artist Matthew Watkins let his fingers do the walking to turn this Mercedes-Benz SLK Diesel convertible into a work of art. It took about a week, some dexterity with a glue gun and a few thousand dollars. Continue reading .