Housings for electronic devices including adaptive plugs, and the use of adaptive plugs in methods of manufacturing housings. The housing may include an opening, and an adaptive plug releasably positioned within the opening. A method of forming a housing may include forming an opening within the housing, disposing a curable material within the opening of the housing, and curing the material to form an adaptive plug. The adaptive plug may be positioned within the opening of the housing. The method may also include performing at least one surface treatment on the housing. A method of protecting an edge of an opening in a housing may include providing the housing including the opening, forming an adaptive plug within the opening of the housing, and forming a barrier on the edge of the opening using the adaptive plug.