This is probably most applicable for water-based finishes, but I suppose it could be generalized to all finishes.
Once a finish has dried / cured, do I need to worry about incidental contact between a finish and its thinner / solvent? I'm not talking about leaving a piece finished with water-based poly outside in the rain, of course, but rather near a shower or sink, for instance. Will that contact with water eventually eat away the finish? Would it depend on the type of finish and/or how many coats and/or how thick each coat was?
I doubt you'd have a similar situation with oil-based finishes outside the shop, but what if you spilled mineral spirits, for example? Would you need to worry about refinishing?