On Sat, 6 Jun 2009 10:22:24 -0700, "iwdplz" wrote:

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

If you need more work to do, please come to my house, and we'll find
some easily.

I would not disturb a seal that isn't leaking to put on a sealant.

I think the light you mention won't leak as long as it isnt'
disturbed, which you shouldn't have to do until the bulb burns out.
At that time, if you put the old seal back so the non-squeezed parts
are in the same place, it will probably still last for years, but if
you want to put on some sealer then, that might help.

Even though they tell you to replace some seals every time you change
a lot of things, I've replaced sparkplugs without replacing that ring
(which I can't get off anyhow) and head gaskets on lawnmowers, and
quite a few other things still using the old seal without ever having
a leak. Of course I look at it to make sure it hasn't been damaged.