1 . Insulates printed circuit board against shorting and arcing.
2 . This paint is used to protect PCB traces from corrosion, moisture.It is also used for repairing PCB after soldering,  rework
3 . Color: black/green
4 . Apply paint on your PCB
5 . Spread it on the PCB with covering the transparent mask film
6 . Expose it under UV light ( or sun ) for a few minutes
7 . Wash away the extra paint by gasoline or oil base solvent