Green 100g PCB UV Curable Solder Mask Repairing Paint Anti-Corrosion~worldwide free shipping 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 This paint is used to protect PCB traces from corrosion.It is also used for repairing PCB after sold