For Reefer trailers, CeramaTherm adheres to practically all surfaces with remarkable flexibility. Use the CeramaTherm to coat the top outside of the roof, interior walls & ceiling, and the underside of the trailer floor. This keeps the road heat from radiating into the box and provides a highly durable waterproof coating. Do not coat the interior floor, as using forklifts and such (for loading and unloading) have a tendency to tear up the finish.