Water intrusion in older Jumbo cases

Didn't see a thread on this so I thought I'd start one. I guess it could apply to the pressure backed and screw back cases as well. From what I've discovered, the Jumbo size snapback cases are prone to moisture and dirt intrusion.
I'm still waiting for the two I just purchased to arrive, but I want to learn as much as possible on the subject now.

Forget how it got into the watch, imagine you look down at your wrist and see condensed moisture inside the crystal. And imagine you are 36 hours away from being able to get the watch to a watch repair facility. What would you do?

My totally uneducated first thoughts to do what I would do when my cell phone or hearing aids got wet. Pull out the batteries and throw the device in a bowl full of uncooked white rice. The rice absorbs the moisture over a four or five hour period, and often the phone or hearing aids return to service without any more needing to be done.

I wouldn't expect that with a mechanical watch...but taking off the back and immersing the watch crystal down into a bowl of the same rice, should at least extract some of the moisture from the movement. It would still need to be serviced to clean it all out and perhaps relubricate the movement. I would put it crystal down so that the moisture wasn't sitting on the dial, and could evaporate without leaving stains on it.

Here is one of the watches I have coming.

John Ireland

John, do the following: buy a few good Watchmaker screw drivers. Buy one of these very fine mesh (on both sides) metal round compartments for ultra sonic cleaning to fit your movement in. Then: pop off the back. Unscrew the stem, always apply downwards pressure during unscrewing. Only a little bit at the time and pulling the crown with the other hand. Until it comes out . Then unscrew the movement clamps. Remove the movement. Put in the mesh container. Then your Rice trick can not harm the balance spring with rogue rice corns getting to it....very careful. Not stirring up any dust. Clean your crystal and dry it out with a hair dryer. Only the case, not the movement. Overnight. then do the same in reverse. And keep in mind, that the cause was not fixed; crown seal and crystal seating the culprits.... Kind regards. Achim

I had the same effect on a UG White Shadow and learned that they are only dustproof.
There where moisture on the inside of the crystal just only by wearing the watch.
There is no solution to that because it`s something of this case design or better a bad of it.
Only thing is to live with it or to sell those watches.

When moisture occure I opened the back and pulled the stem then with the stem I lift the movement a little until the moisture was gone worked for me.

Thanks everyone. Time to get some tools. Maybe I should buy something cheap and in really bad condition to practice on.