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Bathroom Sink Drain: Epoxy FAIL
Apparently, “porcelain chip fix” epoxy survives about a year in a bathroom sink:

Bathroom sink epoxy – top It came loose from the drain rim while I was cleaning the sink; I wasn’t doing anything particularly vigorous.
The stain in the lower right goes all the way around the epoxy:

Bathroom sink epoxy – bottom For what should be obvious reasons, I was loathe to scuff up the sink surface to give the epoxy a better grip, so it couldn’t make a watertight seal all the way around.
A closer look at the stain:

Bathroom sink epoxy – detail I’m reasonably sure that’s iron bacteria colony, rather than actual rust, as there’s no iron to be found anywhere nearby.
For lack of anything smarter, I’ll apply another dose of the same epoxy, although this time I won’t be expecting a long-term fix.