Homebrew PCBs

Well, after much research and discussion, I've found how these 
machines really work. Apparently, the bottom roller is a steel(or 
covered) roller that is partially submerged in a solder bath. What 
prevents the solder from building up on the steel roller is the 
addition of Solder Salts that help to coat a thin layer of solder on 
the roller. Then the top roller is usually made of silicon rubber and 
the more pressure placed between the two rollers, the thinner the 
layer of solder on the pc board. Of course, the cost of this machine 
should be minimal seeing as how the main cost of use is the salts and 
the replenishment of solder. The ability to acquire cheap salts is 
the daunting task; anyone have any ideas on that? I think that the 
machine can be homebrewed and be cheaper then TiNNiT and lasts longer 
as well.