Thanks Dave. I bought some six months ago and experimented by using it on a early Eickhorn Heer dagger. Looking at it now, I can see that the wax has definitely preserved the finish on the fittings. I actually oiled the blade with clove oil and only used the wax on the fittings. I wasn't aware one could use it on the blade too. I will give it a go.

Are there any oils that should be definitely avoided? I read today that the oil I mentioned above will dissolve copper. I guess that could be pretty damazing for nickel plated items.