The last laminating resin I used was something I purchased in Germany. I wasn't even sure it was laminating resin, but it came in three bottles (2/1 mix) and was watery.

I used it on several projects and fell in love with the stuff. I now have some Z-Poxy laminating resin, but it's unopened, so I can't say how good it is.

As far as the polyurethane goes I think it is water based. There is a current thread somewhere that I read last night where the guy was talking about using it for fiberglassing. I don't remember what thread though.