Homebrew PCBs

I found this pcb workshop site, 
http://www.cia.com.au/rcsradio/makepcb9.txt, from Australia. All 
though they describe im somewhat detail their roll tinning machine it 
appears that the bottom roller is rubber? Is that possible? I know a 
major deterant for me is the fact that the metal roller needed flux. 
If the top rubber roller was not affected by solder, then why isnt it 
possible to have the bottom one as well?


> Any thoughts welcome (but the construction of this machine is 
somewhere in 
> very far away future..)
> 
> 
> ST