In the stages of completion of a bass I'm having made by a luthier. I was talking to him about different finishes, seems there are three options: Nitro, Poly, and the Active Catalyzed (sim to Nitro from what I can gather). I know the old Fenders were Nitro, and I've heard it said that this lets the wood breathe better than the thicker Poly lacquers used today. Having some options on how to finish the bass, I don't know weather to go with a thinner old school finish or just the std Poly lacquer and be done with it. If I thought the wood would age better and allow more tone potential over time I would go with that over a thicker finish as I look after my stuff. The bass in question will be a passive 5 string, and I'm trying to achieve an old school tone so if the finish can aid that, then it's worth a shot! Does the finish effect the wood? Is it worth going Nitro/or even Active Cat (not really sure of the difference apart from emissions)?? Any experience would be greatly appreciated..