I just got back from college, and realized how bad my house is in terms of varying temperatures. Where I keep my basses it goes from probably under 50 to about 70 degrees. I live in Brooklyn, NY BTW, so temps between seasons can vary bigtime as well. I have a warmoth bass I finished myself using Nitro Cellulose from Stew Mac. The neck on my warmoth moves alot with temperature, and that kills me, as Im a person who sets up his instrument to have very little relief and low action. I have heard that Nitro is not a very good finish when it comes to limiting movement within the wood, and that something like a poly based finish would work better and be harder. My question is, is there a finish that would provide better protection from varying temperatures or atleast prevent the effects of wood movement better than the thin Nitro I used? Also, would I be able to apply this finish over the nitro, or would I need to sand it completely, strip it, or just rough sand it to give it teeth for a new application of finish. By the way, I am not looking for advice like "Just keep you're instrument somewhere where temperatures vary less." No such place exists in my house; it is a very old, very drafty Victorian. I'm just looking to refinish the neck in something that would provide better protection, not absolute protection; I understand wood moves and will always move, Im just seeking to lessen that effect.