Another way to get a gas-tight crimp is by using self solder/shrink tube
connectors. They are connectors that use a low temp solder. They are
placed over the connection, then heated, preferably with a heat gun, but
even a butane lighter in a pinch. This solders the wire, and shrinks the
tubing around the wire, forming a complete seal. These can be used in
very high moisture areas without failure. Not only do you have a nice
tight complete connection, but you do not have to crimp in awkward or
tough to access areas. There are even crimp/solder/shrink tube
connectors for those who still want to make sure. They are all more
expensive compared to regular crimp connectors, but I personally don't
like to fix things twice.
If anyone is interested, I can post a link or two on where to find them.
I have scads of them from a previous job (I sold maintenance items, so I
have all the toys), and they are very nice.
Steve Bayless
#3491 "Liebchen"
Port Huron, MI