Automatic watches and saunas
Discussion
Having relatively recently discovered the relaxing nature of a sauna and steam room, I began to wonder whether the temperature 'extremes' (not that extreme I realise) could do any harm to my watch? I wouldn't wear any of my older watches in as I wouldn't be wearing them in the pre-sauna shower and swim but found myself in there with my Milgauss. Is there any risk or should I just carry on as per?
It's not scaremongering as such.
A good watch in good condition should be fine, but if there are any weaknesses in the seals then steam will find its way in a long time before liquid water does. The trouble is, steam can be entering for quite some time before you get enough water in there to give obvious condensation, but it can still be enough to start corrosion off.
Bottom line is, it's a risk but not a big one. Given how easy it is to avoid the risk, and having seen a LOT of steam damaged watches over the past 20 odd years, personally I don't subject my own watches to steam even though I know they're proof - the benefit of pressure testing on demand
A good watch in good condition should be fine, but if there are any weaknesses in the seals then steam will find its way in a long time before liquid water does. The trouble is, steam can be entering for quite some time before you get enough water in there to give obvious condensation, but it can still be enough to start corrosion off.
Bottom line is, it's a risk but not a big one. Given how easy it is to avoid the risk, and having seen a LOT of steam damaged watches over the past 20 odd years, personally I don't subject my own watches to steam even though I know they're proof - the benefit of pressure testing on demand

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