The invention provides an improved method and robotic apparatus for preparing and applying a structural member while significantly mitigating hazardous emissions. The remotely controlled robot comprised a series of expandable and interchangeable chambers that allow of site-specific customization. The chambers are linked together by means of flexible interface that allow for the apparatus to conform to the tank radius. A set of synchronized steerable tractor drives are at each end of the apparatus and provide motion across the surface. The chambers have a flexible vacuum seal for the mitigation of harmful emissions. A detachable umbilical with product delivery lines, pneumatic lines, electrical power and signal and video lines contained within remains attached to the robot during the lining operation. The system is suspended from the surface by means of a support structure and center trunnion.