I work on the water and outside in the rain all day long never had an issue with water in my Reo's. I know of people that use there's in the saunas etc have dropped them in the water etc. with no issue. And no with a quick dunk the water will not flow in the juice the physics of it won't allow it to happen it takes pressure for that and unless very deep you'd never get enuf pressure. For a work pv I can assure you it is perfect.
+1
I might add that I am the home of the "swimming" REOs.
I agree that a dunking, for a metal REO, is no issue, as long as you let the water, behind the black insert that "houses" the mechanical firing pin, dry out before reusing. In fact, the best way to clean a metal REO is a good soak in soapy water, good rinse, (and even better with last rinse swishing in bowl of distilled water - but I and probably most don't do that) and then a good drying. The drying is only necessary to get water droplets out of the firing pin area. I doubt that a little moisture would be a problem though. There are two pretty well documented instances where REOs were left to the elements for some time without any issues and they had the batteries in them. One was left in a park, on ground, for over a week. Another was left in a cooler, filled with ice and water.
I prefer to take my WOOD REOs to the spa. When I drop them in, which is almost always the case, I quickly retrieve them, remove AW IMR 18650 battery ( I use full sized Woodvils with 801 connection and atty as I have found that the 801 attys vape better than a 510, after dunking and blowout.... my personal opinion though), wipe off battery and inside and outside of Wood, blow out the atty, wipe the catch-cup, and I'm vaping agian in two minutes or less. I do use Howard's Wax on inside and outside of Woodvil, and use only the tightest pored wood.
(I spend at least an hour but up to 4-5 hours in spa, for therapy; temps no higher than 100F.)
I can't give you specifics on how the metal REO would act, if it got a good soaking, and then removing water from behind black box, by only shaking and blowing, and then using immediately, but I'm willing to give it a try.
I have a Don, too, but the body is not nearly as tough as a metal REO. You probably won't find any metal mod that is tougher than the REO. Also, I find the best color for a REO, that is going to take a beating, is the Silver Anodized, as the anodized color is the same color as the bare, tumbled, aluminum underneath, so gouges and deep scratches don't show as much.
The biggest concern I would have using any mod, after it is soaked, would be the battery. I would not use any battery immediately after it had a good soaking (my REOs that "swim" and are used immediately after are in the water only for a few seconds). A battery would have to dry out for quite some time before I would put it on a charger. Several of my 14500 AW IMR batteries have gone through the washer. I just let them sit for a couple of weeks before putting them on the charger. Protected batteries, with their pcb, protection circuit (a little disc on bottom) would probably have more issues getting a soaking, in my opinion. Any metals/minerals in the water are more likely to cause shorts on the protection circuit board. That's why we "old" geeks rinsed our computer accessories, that could be washed, with distilled water after cleaning them. It was very common, back in the days when keyboards cost >$100 to clean them in water.
Good luck and keep asking questions. I guess it's time for me to do some water soaked metal REO testing. I will be using unsoaked batteries.
Alice