This guidance document is intended to provide safe handling information to professional contractors installing outdoor running track surfaces utilizing polyurethane materials. The primary purpose is to provide information to users and outline best practices for appropriate protective measures for handling polyurethane (PU) or diisocyanate containing products. This document is designed to supplement health and safety information currently available from the material suppliers (i.e., Safety Data Sheets (SDSs) and Product Data Sheets). For specific information, consult the manufacturer’s SDS.