Quick Tip. Photo Etched parts by Javier López de Anca 1: Sand the photo etch surface to improve paint and glue adhesion before removing any part from the fret. Do it very carefully and without pressing too hard, as the parts are very delicate and bend easily. 2: To separate the parts from the fret hold them against a fairly hard cutting surface and use a curved blade. Cut by moving the knife back and forth without exerting too much pressure.