I guess the epoxy resin you are looking for is the R&G LF+LF1 hardener, from german company R&G. It is aerospace quality epoxy resin, and available for modelers too. It's the best I have ever seen, very liquid, and laminates in extremely thin layers and cures as hard as glass. Unsure about the URL, though. They have a superb catalogue as well, plenty with all hints for our hobby, from moulding to laminating.

Regards,
Nicolas.