Many proven goops testified too above to get the job done, but like oil always more to learn.
Rolls Royce sold its Hylomar sealant name off many decades ago. Last couple decade Permatex had the name but lost track this decade as there are a number of sources now and at least a dozen urethane based versions. Last tube I got cost over $50 to have mailed.
https://www.google.com/search?q=hylomar+for+sale&ie=utf-8&oe=utf-8&client=firefox-b-1
See blog below on on selecting silicon. Colors don't mean much, but blue acetic acide gasket maker tends to stay softer less adhesive than black. Last real use I had was on chevy 8 bolt diff. cover that dripped with regular blue RTV, Hylomar Racer's Blue and black RTV, so got a gasket + black RTV smear to seal. I now have auto parts store Permatex Ultra Blue Advanced Formula gasket maker that is essentially orderless toothpaste, not gel, to replace Hylomar tube getting low & the grope monster hid it again.
https://www.permatex.com/wp-content/uploads/tech_docs/tds/81725.pdf
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It depends on what "blue" adhesive you are looking at. Permatex/Loctite/Henkel all make Oxime cure and Acetoxy cure versions of blue RTV. You do not want to ever, ever, ever use an "Acetoxy" cure silicone on an automotive application. The reason is simple, as it cure the Acetoxy cure
system releases acetic acid which is highly corrosive. Picture this; your sle kit has just been installed and the t-case has been resealed with acetoxy cure silicone and as it cures it filles the inside of the t-case with micro-bubbles of acetic acid......can you say corrosion??
The easiest way to ID an acetoxy cure silicone is by smell. You will notice a very strong odor of vinegar that will burn your nose/eyes. If you have that type of blue silicone throw it in the trash and go look for an oxime cure which may also be labeled as a "neutral" cure.
Oxime cure silicones are called "neutral" cure silicones because they only off-gas ethyl alcohol during the vulcanization process. This is not nearly as corrosive as acetic acid so they are used for automotive applications.
As a side note the "ultra" series in auto stores is an oxime cure and the black version contains a higher percentage of calcium carbonate which gives it more
oil resistance.
I make custom adhesives every day for aerospace manufacturers, race teams, US military you name it we make it. If you want to learn more I have data sheets for most of the products @
siliconesolutions.com.
If I can help with anything else just let me know or email me
nathan@siliconesolutions.com <<<<