Sorry for the misunderstanding. I have posted 2 vids shot with the HF200/WP-V1 but they were made before the mods. I have not made a vid describing the mods. I was planning to post pictures and a description but it doesn't seem to work that way here. I guess I'll have to get busy on a video and post a partial link when complete.
As far as the silicone and the V1 goes, its use should be the same as with any other plastic case. Personally, I now eschew the silicone grease entirely because it attracts dust, dirt, dried salt, and other small contaminants. This was always a minor issue with me since it meant cleaning the o-ring and the seating area often. Then I read something that made sense and I had not considered: "The grease itself is not what seals the opening". After application, you always try to remove any accumulation, leaving as thin a coating as possible anyway. So, if the grease is not the sealant, why use it? I now clean the o-ring and seat after a week or so of use on a dive trip. I use spray silicone in a puddle in my palm and thoroughly soak the o-ring. If you let it sit for a few minutes, you'll notice the darkened color and like new appearance. The ring will be slightly damp. Just slip it over a clean detent and forget about it. I do this for my Ikelite housing, a compact housing for my wife's camera, and the WP-V1. The liquid silicone does not attract dirt and is easy to keep clean and reapply.
If you are worried, test it yourself. Do the treatment as described and take your empty case as deep as it (and you) are safe to go. I treat the rubber foot pocket of my full foot fins the same way and the rubber seems more pliable. There have been reports about treatments like ArmorAll damaging rubber over the long run. Silicone spray is not the same thing. Salt water is not the best thing for rubber either. And, I hope you are not going to use an o-ring until it rots and cracks. My oldest case o-ring is over three years old and is still in good shape. I may change it soon just to be safe.