greyface:
How/when do I use the no-fog that came with the housing?
I wouldn't use it at all. Use silica gel dessicant paks instead. I buy mine from
Preserve Smart. If the no-fog stuff works, all it does is address the result, not the cause of the fogging. Like using de-fog in your mask, it doesn't eliminate it, it just keeps the condensation off the glass. That condensation will collect as water drops and that's the last thing you want inside your housing.
The condensation (fog) is a result of the inside of the housing getting warmer than the outside environment from the heat of your camera and the result is a condensation of the humidity inside the housing. Just like your car windows fogging up in the winter. The dessicant paks will absorb the moisture inside the housing. That doesn't mean it will absorb water, it won't. I'm talking about the humidity moisture. The dessicant paks I buy have a small window in the back where you can see the crystals turn from blue when it's fresh to pink when it's spent. You can then revitalize them in a low oven for a few hours.
How important is it to use silicone grease on the seal?
Are you talking about an o-ring seal? There's alot of different opinions on this one. I think it's very important to keep the o-ring lubricated, just don't over do it. Use just enough silicone grease to make the o-ring shiny, don't glob it on as it can then attack and hold sand and debris. Also be careful not to stretch the o-ring as you grease it. I do this maintenance on my housing every evening when I have time to do it properly without being rushed.
Any idea if/how much weight it would take to make it neutral?
No way to even guess without knowing how much the camera weighs. My Olympus housing came with a counter weight that screws into the tripod mounting on the bottom of the housing. I would guess it's about 6oz. But yours may need more or less, depending on how big the housing is, how much air space there is around the camera and how much your camera weighs.
