How to use UV curable Solder mask paint ?

Materials Needed:
1. UV Curable solder mask paint .
2. Thin plastic sheet.
3. UV light source -sun light or UV light.
4. PCB solder mask layer photoplots / printed on transparent sheet eg. OHP sheet. Dark area will be wash away. ie, exposed area become hard.
5. A piece of glass sheet.
6. Gasoline or nail polish remover for cleaning unexposed paint.

How to apply:
1. Make sure the pre-etched PCB is clean and dry.
2. Apply 2-3 drop of the paint on the PCB. We need to make a thin lair coating.So the paint quantity depends on your PCB size.
3. Cover the paint with thin transparent plastic film.
4. Spread the paint on the PCB with the transparent plastic film.Use squeezer to get rid of the bubble.
5. Place and align the artwork over the PCB.
6. Put a piece of glass sheet on top of it. This will help to press it together.
7. Expose under UV light or sunlight. This will take 1min to 30 min depends on your UV light source and thickness of paint.
8. Once exposed, peel off the thin plastic sheet and clean the PCB with Acetone or any other oil base solvent.
9. After cleaning expose it under UV light for a few minutes.
10.Now your board is ready for soldering.

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