Don't mistake this for soldermask. It will protect the traces and solderpoints from corrosion and moisture, after all the soldering is completed, but it will not act as a soldermask, in that the heat from the soldering iron evaporates the paint. I got really excited about using this a few years ago, then really disappointed in the outcome.
The best stuff I have found for soldermask is the Dynamask, found on ebay...verrrry expensive, and the UV Curable Ink, also found on ebay...pretty cheap and in several colors.
--- In Homebrew_PCBs@yahoogroups.com, <homebrew_pcbs@yahoogroups.com> wrote:
Interesting DIY PCB protection/soldermask featured on Hack a Day,
http://www.digitalunderpants.com/polyurethane-for-protecting-one-off-pcbs/