Many, many people use Tinactin powder in their chins dust baths to treat fungus with no ill effects after. I would not use it as a preventative, because I think it's worthless, mostly as Sasha said, because they become immune to it. That's like keeping a child on antibiotics forever "just in case" they get sick. Then when they need the antibiotics, they are useless. Ranchers use Captan to clear fungus. Know what Captan is? It's a pesticide used in gardens. Some states won't even let you ship it in, but ranchers have used it for years and years with no problems.
It's very hard to get everybody to agree on everything. Some of your choice has to come from common sense and your gut feeling. As I said before, if you rub the cream in deeply, there shouldn't be much for them to get their paws on and ingest. If it's Tinactin cream, and you're already using Tinactin powder, go for it. I don't recall you saying what the antifungal cream was before. The Blu-Kote is safe, but you seem to have an issue with the color, so that's why I recommended a vet to get an oral treatment. When I used it, I had to use it for 21 days. A lot of people don't keep up with it, so if you don't finish the full course, what's the point?
When I had a rescue come in with severe fungus, a vet I trust said to use Tinactin in the dust bath, continue the Blu-Kote, and use Itraconazole at 2.5 - 5 mg/kg once a day for 21 days. There, that is directly from a vet. That was also for a very severe case with the tail completely bald, half the face bald, the genitalia bald, and the front paws bald. I was at my wits end trying to treat it, so I contacted a vet. For little spots here and there (we are VERY humid in SD lately) I just use the Blu-Kote and that's it.
