don't like water, but I do get my search coils in the water, mainly when freshwater hunting lakes and rivers.
Now, I'll honestly tell you that I am not a big Beach Hunting fan, generally preferring places far from such sites in desert or mountain ghost towns, homesteads, and other older sites. But, before I moved to Vale, Oregon I lived in a quiet little town along the Columbia River in Oregon where I worked my FORS CoRe a fair amount. Never had any issues with it. No leaking, no bad behavior even in the nasty, very mineralized beach areas or on the kinder park beach sand.
I only visited an Oregon coastal beach once with the CoRe, but I also hunted on a much more mineralized as well as much saltier environment at the Great Salt Lake in Utah ... No problems. I've had the FORS CoRe, FORS Relic and Makro Racer 2 there. In all cases I was able to hunt without any problems, and generally used one of the 2-Tone Discriminate modes as I prefer in more open areas.
Monte