How old was the epoxy? I bought a batch of 2-hour from my LHS a month or so ago, only to find out it was more like a two week curing time (and it still wasn't hard, despite the "leave it in the truck with the windows rolled up trick"). I looked on the price sticker date from the original package, and it was dated '97. I took it back and got it replaced, but I'm still left with a float and glass that didn't cure right. I've since put some newer 30-minute on top of the glass, and that seemed to do the trick. I guess what I'm trying to say, just make sure your epoxy you purchase is relatively fresh.