Killer PCBs

Step 10 Solder Mask & Silk Screen

Apply solder mask by scrubbing and re-laminating etched board with a new layer of resist, then remove the protective outer film and apply a second layer of resist to double the thickness. Now expose with stop and silkscreen layers and develop as before (exposure may take slightly longer due to extra thickness of resist). Bake in toaster at 200-220 degrees F for about 10 minutes (being sure to prop up the board so that the resist won't stick to the toaster). Remove the board from the toaster and use a white crayon to fill in the silkscreen text while the board is still warm. Wipe any excess crayon wax off with a towel and use a toothpick to remove excess wax from grooves and traces.