DVD-38 begins by explaining the purpose and advantages of liquid photo-imageable solder mask and visually examines each step in the application process, including surface preparation (both abrasive and chemical pre-wash), screen and curtain coating (including thickness evaluation), tack drying, exposure (including environmental controls, clothing, artwork alignment, and machine operation /maintenance), developing (including machine operation for both aqueous and solvent systems), inspection for typical defects, and the operation of a typical curing oven. Time: 29 minutes.