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Originally Posted by Quoth
It's a coating on the final fully assembled board. Seems to be just a modern version of the late 1930s (or maybe early 1940s) lacquer or varnish coating called tropicalization. Later the actual bare PCBs often had a "procoat" (protective coating) screen printed on that covered the tracks but not the solder pads (common since 1960s, though PCBs date from 1950s). The HzO like all tropicalization is an additional coating after soldering and assembly so gives the effect as if cables (and SD card if there is one) are glue in. The USB connector contacts are masked during application and usually gold plated anyway. Tropicalization, procoats and conformal coatings are synonyms and may be applied by a spray or dip.
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Thanks for the info. The HZO site does say this though, which might allow Kobo to have coated subassemblies as spares:
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The materials used in our Spectrum of Protection™ are formulated as part of a specific recipe, bringing together the ideal process to meet the most demanding requirements, successfully life proofing your device, assembly, sub-assembly, or circuitry.
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(Spectrum of Protection™
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But realistically how many subassemblies could there be in an ereader? Battery, main board, screen, buttons, er...