I dont mind the idea behind dipping, so long as it makes sense. Like lighting up a torch (even with a candle) makes sense because they generally have flamable substances on the top so even a very small fire could light up the torch.
It giving you a method of making your weapon attacks flaming though.... Uhm, no. Like some others suggested, unless you use some sort of coating first it shouldnt do anything to your sword.
Keep the mechanic but fine tune where and how it can be used.
