Walk the line - Version 2

The picture below shows the PCB for Rev2 for the line following robot. It has a few upgrades and modifications on Rev1, namely:
- Operates off 6V supply (4AA batteries) - Rev1 was designed to operate off 4.5V (3 batteries) but this wasn't enough voltage for the motors - hence the upgrade
- The footprint on the pots fixed - just messed up the numbering of the pins - grr
- Removed some testing LED's - the algorithm has been verified now so I can free up some boardspace


Interestingly I'm still looking for a better way of protecting PCB's - the following have been tried:
- No protection: copper corrodes and looks horrible
- Leaving photo resist layer on - it eventually scratches off in patches, that corrodes and looks horrible
- Solder screening - invariably some bridges are created which need to be tracked down, doesn't look particularly nice
- Spray on coating (currently use) - dries overnight, smells horrible, makes a bit of a mess when soldering - but does the job fairly well (although it can be a bit patchy) - possibly I have to try some different spray on coatings