I'm not surprised to hear that the food grade coating in the Wedco water cans has problems, as I have experienced it first hand.
I have a Wedco water can and spout. I bought them 3 years ago, and never used them until last year. After just a few days out on the trail, I noticed brown rust spots around the neck of the spout. After a week on the trail, I poured water from the can, and it was noticeably brown and smelled of rust.
I contacted the distributor I bought it from, and they replied "The can is metal, and metal rusts. There is no guarantee it won't rust." He went on to say that he dries them out each time he uses them. Since mine was dry when I bought it, and rusted within a few days of having water in it, I cannot see where drying it out after each use has any value to a user who is on the trail for extended periods of time.
So, I spent about $65 for a can an spout that are useless to me.
I tried contacting another distributor, to see if there was any solution or way to recoat the can. No answer from them. Since I know they monitor this forum, I would really like to hear if there is any contact info at Wedco. So far I have not been able to find any.