Solder Mask Ink, 2 Pcs Black + Green PCB UV Curing Solder Mask Ink, UV Curable Solder Mask Soldering PCB BGA Repair Paint, PCB Solder Resist Ink Now the UV light should have hardened all but the areas protected by the mask, take it inside and remove the mask and lightly scrub the pads with turps using a UV curable solder mask is a special type of resin that hardens when exposed to ultraviolet light. It comes different colors in a syringe type tube.Cover the board with the artwork matching vias and pads. Expose the board to the Uv light for about 1 minute. Take it out and leave it rest for 5 minutes. Tip
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