Alcohol will not hurt the bluing on your gun any more than gun slovents. I have experience with a brand of camo gun tape I don't remember the name but I put it on an O/U for waterfowl hunting and i stayed on fine, in fact I also put it on my SS thermos bottle at the same time. I went to remove the tape about 5 years after I put it on and that is where I had trouble, I cannot even remember how many different solvents including nail polish remover and alcohol and many other things, it took me days to get the tape off the barrel and reciever of my gun. That was 30 plus years ago, the tape is still on the thermos. I am sure they have made some improvements to the adhesive by this time. If you are leary about the tape, they make an elastic cloth wrap in camo, I don't know how well it stays on though.