Pat Patterson, a painter for Delf Painting Contractors, spray-paints one of the rooms in the Burns Park Barn, being remodeled for use by senior citizens and creative activities classes of the Ann Arbor Recreation Department. After painting, the only remaining portions of the job to be finished are the floors and paneling. Mrs. Mary Pratt, who is coordinating the donations of material and volunteer labor from local contractors and unions, hopes that all work can be finished in time for the open house, tentatively set for June 15.