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I'm re-rigging my boat and re-using the Stalok terminals that have
been in use for 19 years. I put them new when I re-rigged it 19 years
ago. The instructions say to put a grape-sized lump of silicone
sealant in the terminal "base" when assembling the terminal so as to
keep water out.

Well, I did that and it kept the interior almost dry - but the
silicone acts like an adhesive and makes the "wedged" wire really
really hard to get out of the wedge shaped cavity in the body.

So, I wondering about some long-term sealer-filler that not an
adhesive. I've gotten 8 of 8 apart so far, but don't want to go thru
this again.

Maybe Dolfinite (it shrinks). Ideally something that expands when it
cures, is rubbery, not UV bothered, and zero adhesion to s/s.

Suggestions?

Let me get this right. You used silicone as the makers recommended and it
was satisfactory for 19 years although you then had a bit of trouble
dismantling the fitting. But you managed it Ok. And now you want to try
something different and untested so that in another 19 years it _may_ be a
bit easier to dismantle??!!
Your priorities seem quite wrong to me.
What is more, some of the substances that people are suggesting sound as if
they will be even more difficult to dismantle and you will not have the same
assurance that they will work like the one the manufacturers recommended.
I recommend you stick (sorry!) with the silicone.