timz
Contributor
If you are using internal flash with a poly-carbonate housing it is very difficult (almost impossible) to not have the housing fog, especially the Canon/Meikon which tend to fit snug.
Ikelite is probably slightly better as their is a larger volume inside the housing, but for the extra money I ended up going down the aluminium route and never have any fogging issues now.
If you are finding specific buttons leak, an issue which I had, where you would get a few drops in the housing, I found applying some extra silicon grease on the shaft (inside & out) helped a little.
Yeah.... i later found out that there was a drop of water in the housing. I changed all the orings of the dial and buttons and the main oring with grease. Didn't fog after that.