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What type of black resin is used for this?
Lots of choices --
https://www.milspecwiring.com/RACEGEL-POTTING-COMPOUND_p_2277.html
Here's a good kit to have. There are different epoxy types that will fit that dispenser --
https://www.prowireusa.com/p-2360-epoxy-dispenser-10-pc-mixer-kit.aspx
That Prowire kit is pretty well priced too.
Most common epoxies used are Resintech RT125, Hellerman V9500 and there is a Raychem equivalent too, but the part number escapes me... Should be able to find it pretty easily on the google-o-tron :-).