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Retinning edge contacts, or reconditioning?
NoOne=NBA=:
If you're trying to build them up to ensure good mechanical connection, I'd go with tinning.
It will add height, much easier than the conductive paint.
That will increase connection pressure, and may result in a larger area of contact.
That being said, you might be better off to just replace the edge connectors themselves, to achieve a tighter fit, and better mechanical connection.
ChadTower:
That's part of the plan... not to replace the connectors, but to replace the pins in the connectors.
SirPeale:
Don't forget to clean the connectors as well.
Tinning the edge is fine. It's a good way to build up some bulk to make sure the edge can actually contact the pins.
The *best* thing to do would be to replace the connector. Usually that's really difficult. You could also flex each pin to have better contact with the PCB.