Industrial epoxy is not normally available to end user unless he has connections but yes your right but not in all cases and remember the usb port itself is very small and you would probably have to ocmpletely cover it over a large area to do the job properly, not good if you ever have a dry joint situation after.

It is very easy to clean and scrape even the port jacket with a sharp hobbiest knife and when you use flux it cleans the metal anyhow as well as the copper on the board, use a hot enough iron and job done finished without the worry of a short circuit as your only soldering the sides and not the pins on the rear, a much easier job to do i promise you.

I never have liked the idea of epoxy because if something goes wrong after and you need access under the epoxy you got one hell of an impossible situation on your hands, when you solder it can always be reversed very easily, that is the difference between both situations Randall.

A preventative fix is such a small job we are talking about here as it only takes maybe 3 or 4 minutes to complete once you got the N900 apart and then re-assemble job done.

I have never seen a Nokia replacement that people say feels a lot stronger when they push the usb plug to socket but i bet you they have soldered in the way i have explained and no way they would expoxy because too many components around the port.