Removing imperfections on Frame
You may find that after sanding the Bondic there may be some slight imperfections on the frame. I used a long standing secret among plastic model builders.........Pledge Floor Gloss (formally know as Future Floor Shine). Among its many uses it to render clear plastic (such as model airplane canopies) crystal clear, act as a clear coat on model car bodies and can simulate glass lenses on aircraft instruments. Dipping the frames into the Pledge a few times produces a smooth, clear acrylic coating that looks great once painted.