Homebrew PCBs

Hi,
has anyone ever heard of this "Liquid Tin" by m.g. chemicals ?
this material is supposed to plate the PCB after the etch process, and passivate the copper. 
I never seen this stuff sold anywhere, and I can't get it since I live in Israel. 

first, a link to see it with your own eyes:
http://www.youtube.com/watch?v=3aEwTRMEkOM
look at around 3:30 minutes...

second, does anyone know how to home-brew this material ? Is it dangerous to use ?

third, does any of you use any other process to passivate the copper after etching ?

Thanks in advance, 
Liquias.