My leaky Seal Dry latex waders gave me toe nail fungus in the late 1980s. :-( Took me decades to finally get rid of it.I certainly don't expect everyone to agree with me but as someone who has been steelheading in waders for over 30 years i think waders just leak. Brand new simms you get about a year maybe a little more of hard use and you start getting little leaks, leaks that leave your fleece a little damp. fix what you can and just chock the rest up to the cost of being a steelheader, wear the right stuff underneath and you'll be ok maybe a tiny bit cold but that's just steelheading..
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.