Hmm ... let's discuss this a bit more. I am still trying to get my head wrapped around the conflicting strong opinions on this issue, after years of dealing with my boats' wires.
What are the opinions you disagree with?
1. I agree that the grease can defeat the adhesive during shrinkwrapping, if the operator is not careful doing the procedure.
Careful or not with the proper crimp tool and a quality adhesive lined heat shrink connector there is no need for it..
But consider this: If the operator carefully puts a bit of grease only on the bare metal wires inside the crimp,
No, no, no!! Yes, I have strong opinions on this because a dielectric grease should never be put in between the wire and the terminal as it is intended to BLOCK conductivity NOT enhance it!!! Why not just strip the wire then wrap it with electrical tape then make the crimp over the tape??
A good many people, including folks on this forum, incorrectly use dielectric grease but it still does not make it correct usage..
then that portion of the adhesive-lined shrinkwrap away from the grease around the wire leading up to the crimp will stick fine to the wire, sealing out moisture from wicking up at that end. The adhesive might also stick over the crimp itself, but if some grease contaminates the surface of the crimp, then the grease could (in theory) do the job of keeping moisture out, while the grease around the wire ends inside the crimp protects those wire ends in a way the adhesive cannot, especially for terminals crimped on the end of a wire, as in at the ignition panel. If the joint is a crimp between two wires, and the operator keeps the grease off the wires leading up to the bare ends, then the adhesive will stick to the wires at both ends, keeping moisture out of the joint, but if any moisture does get in, then the grease is there as a second line of defence.
A proper adhesive lined heat shrink terminal covers the end of the wire! As I said use the right crimp tool and quality adhesive lined heat shrink terminals and there is no need for dielectric grease.
There is NO WAY water is wicking up through this crimped and cold formed terminal. The wire strands and the terminal have become one solid mass and like the wall of a copper pipe water is not getting through..
With a cheap crimper you may not get a true cold formed crimp. As you can see here the wire strands are still exposed and have not become one solid mass of copper.
Moisture wicking up the wire of a proper crimp stops dead at the crimp because it is truly cold formed meaning it has become one single mass of copper.
2. On another forum here, I asked about the best way to use dielectric grease. The reply I get to this question, consistently, is that a solid metal-metal connection (as in crimping or a tight bolt/thread fit) excludes the grease so that the grease does not increase resistance in the joint significantly.
This is good information. A proper crimped connection does NOT include a dielectric grease..
Please lets keep in mind that thousands of well drillers throughout this country use adhesive lined heat shrink & crimped Stakon connectors on wires submerged in artesian wells to depths of 300 feet or more with NO dielectric grease. These well pump wires stay dry while SUBMERGED with ONLY adhesive lined heat shrink...