I use the RAKA 350/127 no blush epoxy
not sure why you says it's not thin enough to seal, thats what it is designed to do. I heat the plugs in the oven first so that helps with absorption. when the plug is warm it drips all over the place and flows through the wire holes and drips out the other end like water.
( for those that aren't familiar with RAKA, they sell epoxy primarily for boat building)
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