Ultra Additives, Inc. announced the appointment of three new domestic sales managers. Dianna Renz has been named regional sales manager for all paint, coatings, adhesives and ink industry sales in the southeastern U.S. Prior to this appointment, she was with Degussa for nine years, serving most recently as a product manager.      Mary Taylor is the new regional sales manager for all sales and technical concerns for the industrial fluids business on the east coast, including Canada. She spent t...