I have used the polester resin before and if the catalyst and resin are old it will never get totaly hard. I had this happen before and when I contacted the vendor they had me read the date code and said, there's your problem. It took alot of sanding with 60 grit paper to get it off, so ck the date code. It also sets up faster than epoxy 20min max in most cases. I like this process here.
http://www.youtube.com/watch?v=1rcKyCMDBJE I also want to try the deft process and also the w.b
poly. I agree the best way to mix epoxy is to weigh it. I recommend making up some sample pieces.