Paintzen, an on-demand home and office painting service, has officially launched in DC. It’s a welcome addition to the service economy: use it to find, book and customize any paint job you want, then manage all the logistics through their user-friendly platform. On the fence? 100% satisfaction is guaranteed, so there’s zero risk in trying out something new. Crews are insured and background checked, and all paint and supplies come with your order (and…