Immunox Fungicide on Tomatoes?

[Greatgardens]

Has anyone used this? It only lists Powdery Mildew as a tomato target of the product, but some people claim it is effective on other foliage diseases. The biggest advantage that I see is that it is effective for 10-14 days and "rainproof" after drying. That would be a blessing here. Active ingredient is Myclobutanil.

Are there other fungicides that are rainproof? Maybe Neem oil, although I'm leery of Neem since it can gunk up spray equipment.


-GG