I have a tube of Tri-Flow synthetic grease and I am tempted to use it on all
o-rings and gaskets that will be exposed to water. But I'd like to know, is
there ever a kind of water seal that I should not use it on? For example my
underwater pool light gasket does not specify any grease. But what if I put
some on, will it help make it last longer before it starts to leak?

http://www.triflowlubricants.com/Syn...synthetic.html