Homebrew PCBs

I haven't tried this but.. I recently had some experience with the solder paste used for surface mount chips. I'd never used it before but I noticed some very useful actions it has.
 I was wondering if the paste was injected (using the syrings it comes in) into holes where you want a connection top and bottom making sure a bit gets onto the copper rings on top and bottom of the board if, when heated - perhaps with a heat gun so that the paste will not be attracted by a soldering iron - if the solder paste might melt in place, connect the top and bottom, and stay in place by capillary action while molten until it cools.

 I've always just soldered small wires into the vias or made sure that legs requiring through connection are soldered both sides but it's a real pain.

If this works - remember you heard it here :-)

Sage