RE: Island Gypsy
It depends on what type of sea cock they are. If they are the tapered cone type they need to be disassembled, cleaned and polished as previously described.
If they are ball valve type sea cocks, try forcing them with a handle extension. Ball valve type sea cocks have teflon seals and they just need to be exersized a few times a year. If you can't force them with a handle extension or the handle breaks, replace them.
If they are just ball valves screwed onto thru-hull fittings, don't try to force them or you might break the thru-hull fitting. Replace them with real sea cocks with mounting flanges.
If they are frozen open, you should haul soon and deal with them.
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