Aren't coatings only on the outside of the front element ? Since most of the fungus I encounter is usually on the internal glass, there isn't any coating to get damaged ....?
From what I've read there are different 'breeds' of fungus - some more aggressive than others. I guess it depends how long it's been in contact with the glass aswell. I also read that even when the glass has been cleaned there are still spores lurking inside the lens body and workings which can re infest.
Thanks for all the info
The coatings are also on the internal lens elements.