I have a new Aquatica Housing for my Nikon D800, and I'm having a heck of a time removing the port covers (not due to any vacuum problem), and getting the extension ring off of the macro port. I spoke with Aquatica yesterday to see if there was any magic, and they suggested lubricating my O-rings. I'd already done this, of course, but the Aquatica supplied O-ring grease is of a different consistency than what I'm used to. It's kind of like a white paste. It's possible that the color is throwing me off, but it seems more tacky, and less slippery than the clear silicone grease I used to use with my Subal housing. Now I'm on a mission. I'm hoping to find an O-ring lubricant that can be used with both my Aquatica housing and my Inon strobes, that's slick and slippery. Has anyone compared the consistency of Dow Corning's Molykote 3451 to Tribolube 71? It sounds as though either of these can be safely used on any of my O-rings, but which ones would give me slicker, more slippery O-rings?