My leaky Seal Dry latex waders gave me toe nail fungus in the late 1980s. :-( Took me decades to finally get rid of it.
If any of you have toe nail fungus, pull a chair up to the wood stove; I might have some ideas on how to get rid of it, and how to avoid having it return.
These days, I buy only expensive Gore-Tex waders with excellent warranties and service. Sometimes, the socks will get damp from hiking. I pay careful attention in case it is a leak.
As required, the waders are gently pulled inside out in order to completely and thoroughly dry. They also get occasionally washed. I have in the past lightly applied Lysol aerosol to the inner boot when still waging the epic battle with toe nail fungus. Arrrgh.
If I cannot easily fix the leak, in the waders go for warranty repair, or what is often the case, warranty replacement.
Thankfully most anglers do not understand insurance economics. They seem to have no idea whatsoever as to how they are cross-subsidizing my passion and the passion of other keen, hard-hiking, aggressive wading anglers.