A film-application apparatus includes a body including a first body half, a second body half, and a hinge coupling the body halves; and a squeegee blade movable from a first position relative to the body to a second position relative to the body. The second body half is rotatable about the hinge relative to the first body half to a closed position. When the second body half is in the closed position, the body includes a top ring and a bottom ring both centered on an axis and defining an axial gap therebetween. When the second body half is in the closed position and the body is enclosing a sensor having a cylindrical sensor window, the axial gap exposes the cylindrical sensor window, and moving the squeegee blade from the first position to the second position covers substantially an entire surface area of the cylindrical sensor window.