I used to work installing Automated Guided Vehicle Systems. The pertinant aspect
of that is that we ran miles of wire inbedded in concrete floors.  When we needed
to splice wire that would be buried in concrete we did pretty much as you
suggested.  The wire was crimp spliced with a bare crimp. Soldered the
connection.  Brushed with "Scotch-Kote" (the official liquid tape). Covered with
heatshrink, and then coated with Scotch-Kote again.  Very permanant. No failures
once installed, even underwater.
Mark

> ... does anyone have any experience,
> thoughts, ideas regarding using 'liquid electrical tape'?  I've felt it
> seals better than the shrink tubing, but don't know how long it lasts.  (as
> an aside, swaged connectors are really marginal at best - they should be
> soldered wherever possible after swaging).
>
> Austin