Another thing to watch out for is salt on the O-ring. After 3 or 4 times diving, and soaking between each time, surface checking the o-ring, I had some moisture in the housing after a long soak (OK, I forgot the thing in the sink overnight). I took out the o-ring and there were several salt crystals on the bottom. Now I finger wipe the o-ring and regrease it about every 5-6 dives. I also had the shutter button stick on me last dive. It came back after 7-8 presses and pulls, but I made sure and pressed it about 100 times in the sink in clean water after the dive. I read a maintenance thread about using syringe to squirt a little food grade silicone into the slot around the buttons. Any thoughts? And should that be inside or outside the housing?