With advancements in practiced machines, there has been a broad requirement for more up-to-date materials that have special mechanical properties notwithstanding when exposed to unfriendly ecological conditions. Among the materials that have been researched, fiber-reinforced polymer (FRP) has turned out to be a good possibility for the generation of sound structures. In addition to being one of the least expensive types of composites, it is not difficult to fabricate and broadly accessible. Moreover, the mechanical properties of these composites have turned out to be utilized over an extensive variety of natural impacts. The investigation of their naturally visible properties, like visible disfigurement, percent area of fraction, circularity ratio, and micro hardness, are essential surface properties that determine the strength and the appearance of the external part of the composites after exposure to the degrading conditions. This chapter analyzes these properties, which were found by exposing the composite samples to a hygrothermal environment as well as chemical exposure. The samples were of the following particular types, including glass-FRP (GFRP) and carbon-FRP (CFRP) laminates and GFRP thermocol sandwich composites. © 2019 Elsevier Ltd. All rights reserved.