I would rather keep regular top-ups to monitor consumption and keep the level low. When I had the feeder full there were a few drownings, which I don't like to see. I've read that thymol odour can hang around for ages in the comb and seen recommendations that keeping feeders sterile will avoid mould. However I doubt that is a complete solution. Anyway..I don't fancy thymol in our honey. 
Being new to this I don't expect to get even a drop of honey (with or without sugar) for myself until well into next season. By then I hope that any stored sugar will be used up and that next year, the bees will find enough natural food to manage without feeding.. But I assume they will still be making use of the comb manufactured now and might that be tainted by thymol?
Because it won't
Look in the stickies section, there are two recipes for thymol mixes and advice on their application
But it seems odd - how would the bees avoid introducing a taint.
Lots of beekeepers use thymol in their syrup for winter feed. I’m sure some will get into honey if they are not careful. As for tainting the wax, well you don’t take honey from brood frames and you don’t feed thymol syrup or any syrup to get the bees to draw a super.
