I like to use TW25b. Mil-Comm.
Temperature Rating,
-90 degrees F (-67degrees C) to 450 degrees F (232degrees C)
Proven Superior in,
Sand, Salt water, Humidity.
Delivers Excellent Corrosion protection.
Non-Toxic. Non Flammable, Environmentally Safe.
Made in the U.S.A.
I wish we had this stuff in Vietnam. It has it's own N.S.N 9150-01-448-2266
I've tried most of them. This seems to work for me.