Lacquer works if you just want to display them. Other than that, though, I wouldn't keep brass in any of the leather because of the corrosion it (the leather) causes. I only fill my loop-strips when I am on the range, ready to shoot the stages (Cowboy Action Shooting), any other time I leave the leather empty. To me, it just seems too much work. Clean the brass, lacquer the brass, coat the loops with Product X, rinse, repeat, rinse, repeat.