Aqua Seal. Neoprene patch + aqua seal if there is a hole. Dry waders completely before patching.
This is my professional advise as well. Use a good, heavy duty backing tape if the tear is more than 1/2", then aquaseal or shoe goo.
This guy ^^^^ just may have fixed a pair or three.
Two and a pair of over-priced muck boots……last week. Lol, holy waders are no fun below freezing.
Was thinking the other day, and I think I’m in waders about 4-500 hrs per year. “And not in a good way”, as they say around here. Still better than working for the man.