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As Steve says, it's epoxy and something very similar is available as potting compound which is used for encapsulating electronic assemblies for protection against vibration failure, corrosion etc. Many electronic suppliers will stock this. A cheaper alternative would be standard 2-part epoxy resin.
Its also very tough stuff. The only thing that will affect it besides very high heat is concentrated hot Hydrochloric acid.
Its an epoxy resin, I don't know the exact mix, but there are plenty of epoxy makers out there.