Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

It's probably something like the material discussed here which is used for
coating wood and other materials:

<http://www.cytec.com/uv/Downloads/Water-based%20Radiation%20Curable%20Polyurethane%20Dispersions.pdf>

This is the stuff his company makes:

http://www.cytec.com/uv/Downloads/UCECOAT%20-%20Wood%20Coatings_EMEA_En.pdf

Leon