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Silicone o-ring grease is silicone o-ring grease... in terms of cameras. (Regulators? A different topic.)
If you buy it at a SCUBA store it comes in a nifty little container with a keychain. Well worth the price. Have a couple.
If you want it in bulk and cheap, get food grade o-ring grease used for milkshake machines. By the weight, it's lots cheaper, but nowhere near as convenient to carry or use. I have used this on IMAX camera housings.
Doc AdelmanPADI way before there was numbers
â€‹............This is weird -> u/w micro pix ....................... SeaDrops Plutonium:Refined from glistening beads of perspiration gently blotted from the downy
naked inner thighs of our private stable of free-range virginSwedish Divemistresses. ..........................................(Demand it at your SCUBA retailer and pay the highest price~ this alone ensures it's better mask defogger than toothpaste)
Are the o-rings buna (flat black) or silicone (glossy colors including black)? Buna uses standard silicone lubricant used in other SCUBA o-rings. Silicone takes a different lubricant. Using the wrong lubricant can cause the o-ring to swell and fail.
Dow Corning #55 O-Ring Lubricants
These silicone lubricants reduce friction between rubber and metal parts. They resist oxidation and form a tight seal causing the O-ring to swell. Not recommended for O-rings and seals made of silicone rubber, polycarbonate, or ABS thermoplastic. Temperature range is -85° to +350° F.
Silicone Lubricant— Use with virtually any rubber polymer including Buna-N, neoprene, and Viton. Temperature range is -65° to +400° F.
Barium Based Petroleum Grease: Use with sythetic rubber seals in low-pressure pneumatic systems. Temperature range is -20° to 180°F.
Actually water works just fine on housing backs where there isn't much of a sliding action, just compression. The lubricant contributes nothing to the seal, it just lubricates and can also catch sand and fibers which isn't good.