Mechanic LVH-900 UV Paste Green
UV Solder Resist PCB UV Curable Solder Great Mast Solder Mask Solder Resist 10g
This UV Solder Resist is used to protect PCB traces from corrosion, moisture.It is also used for repairing PCB after soldering, rework.
Apply paint on your PCB.
Spread it on the PCB with covering the transparent mask film.
Expose it under UV light ( or sun ) for a few minutes.
Wash away the extra paint by gasoline or oil base solvent.