Now your PCB is laminated. Place a 100 watts light bulb twelve inches high over the PCB.
Place the artwork film on the PCB and put a clear glass on top so the weight of the glass makes the artwork and the PCB better adhered to each other. Illuminate the bulb for approximately 15 minutes.
Mix the developer powder with 200 cc of clean water and stir them until the developer and the water completely mixed.
Strip off the other cover sheet.
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From : http://www.warapcb.com/dryfilmNextpage2.php