I noticed that on ebay you can purchase UV curable paint
for creating solder masks on your home etched PCBs , but the attached instructions that it comes with are woeful. On the auction description and the bit of paper that eventually came with it all it said was.- 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
Which sounds a bit sparse and inaccurate for my liking, so after some investigation and experimentation i've come up with this guide.