Homebrew PCBs

Bob Weiss wrote:

> 
> Does anyone know what they use on PCB's to give that green coating 
> that they then apply silkscreening to? Can this be purchased? IF so 
> where? What are the benefits to using this?
> 
> 

Google: "soldermask"

http://www.rockwellcollins.com/about/additionalproducts/collinsprintedcircuits/page1823.html

Normally applied as a film and exposed/developed much like etch resists 
except this stuff never comes off. Older methods would silk screen 
soldermasks, newer methods use Inkjet technology to print directly.