The DWR coating needs replenished periodically if your waders no longer have water bead on them. Now is the time of the year you want to make sure you have no leaks and that your waders are functioning properly. Unintentionally wet wading the Owens (or any other river for that matter) in December and January can be unpleasant.
Simms has a good video on how to correct simple wet out.
http://www.bluequillangler.com/Customer-Service/Renewing-the-DWR
Simms uses Revivex, but I prefer Nikwax products which seems to last longer and is simpler to use. You can purchase Nikwax products from Sierra Trading Post online and I know Revivex can be purchased through Amazon. I'm sure other places sell each of the products as well.
What brings this up, you say? Yesterday when I stepped into my Idaho local, I suddenly felt cold water on my left foot as the water was a brisk 51.9 degrees and outside air temp was 39. Not a good sign as I had just worn these waders for 4 days fishing local rivers a week ago and stayed dry the whole time. I came to fish, so I fished all day, but obviously had to repair these waders soon. Unfortunately I didn't have a backup pair, so...........I had a cold left foot at the end of the day. Wet out didn't cause this, but I noticed how dark the waders had turned where the water hit them, which also told me that they were wetting out on me as well. I'll admit that I haven't been taking as good of care of these as I should be. I hadn't ever washed them (recommended by the manufaturers of Simms and Patagonia for sure--I don't know about others as I haven't researched those other brands but assume they are the same) and I'll admit that often they probably aren't as dry as they should be when I throw them in the back of the truck, ah well, time to correct the problems.
First thing I decided to do was check for leaks. Visually I was able to find a visible hole near the tail end. Ah, the thorn that got me near the end of the four day. I wondered if it had went through, and it did. Noted its location for repair. I then turned the waders inside out and sprayed them with rubbing alcohol until they were damp, then turned them back and looked for the darkened spots that would indicate pinhole leaks not visible to the naked eye. I found several on the left leg and two on the right leg and marked these with a magic marker. I then used some Loon Wader repair on the pinholes and the tail end hole by speading the Repair goop over the holes and covering the spots with cellophane while I cured them. You can remove the cellophane in about 1 minute.
Loon Wader Repair is like aquaseal but it is UV activated so it cures very quickly in the sun or even quicker with the small UV light I have. You can use aquaseal, but unless you use the aquaseal with the cotol accelerator it will take a lot longer to make the repairs as it will have to set overnight. Also the wader repair can go on dry waders or wet, so it makes a great field repair item--I always carry a couple of tubes in my bag. Just remember, DON'T APPLY THIS IN THE SUN. It sets very quickly.
Turn the waders back inside out and you'll see where the magic marker bled through marking where the pinholes were. Put the wader repair on the inside spots, cellophane the spots, zap them with sunlight or a uv light, and turn them back to the normal wearing postion.
The leaks are all repaired now to solve the Wet Out Issue.
First, I cleaned the waders. I washed them in sink with a mixture of Nikwax Tech wash and hot water. I do this by hand although Patagonia says you can machine wash the waders in a front loader, but.......I still do it by hand. I rinsed them out well and while they were still damp, I liberally recoated them with Nikwax TX.Direct spray on and hung them to dry. Now the wet out is corrected and all the leaks are repaired. The waders are ready for another winter of wading if I would just quit going through brush, wild berry bushes, rose bushes, sitting where I shouldn't sit--you know, the things all us flyfishers rip through and do while fishing.