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?
They state: This pure synthetic grease is fully compatible with most
rubbers and plastics.
Key word is "most". I'd guess it will not bother the O ring but I cannot
guarantee that either. It may not make it last any longer, but may help it
come apart easier later.
Does grease help to fill the microscopic gaps that might occur when the
o-ring is pressed against the metal, thus reducing the chance that water can
seep through these irregular areas, or is the purpose of grease on o-rings
exclusively to stop them from sticking over time?
If you need more work to do, please come to my house, and we'll find
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.
mm - the previous seal was leaking.
The Amerilite pool light was half-filled with water, causing the light to
The old o-ring was nice and tight, it was just old and weathered.
So I want to make it more reliable if any way possible, not looking for
extra work to do.
He's saying it will be opended by the time you replace the bulb, so
you should get a new seal rather than rely on grease. I'm sure that's
better, depending on how hard it is to find the right seal and how
much a third lightbulb woudl cost. For one thing, this seal is under
water pressure, which is alot more than if it were in the air but
subject to rain. A couple millimeters of rainwater sitting on a seal
is nowhere near the pressure of 1 foot, 2 feet of water, or however
deep your lights are.
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