All depends on the quantities to be produced.
If the quantities are few hundred pieces the epoxy solution will be fine, take in consideration that the epoxy requires a box, curing time, opening the box, repairing, etc.
If the unit has to be produced in 1000's pieces, the approach is very different because you need something fast, for example paniting the board instead the epoxy etc.
About repairng, if the quantities are good, and being the circuit quite simple, in case you receive a failed unit, just replace it with a good one and discard the broken one.
Acthallu a 324 cost few cent, is not worth to fix the board, the time spent for troubleshooting is much higher.
Mandi