...hmm, there was def. no spring to the plunger, and I don't think the red button was flush with the bottom. The clear looked OK. I must admit it looked pretty thin. However, I don't have any experience with 2 part paints or hardener, so I'm not sure I know what to look for. To be honest the can was expired. I ordered it a few months back, and the manufacture date was 15Mar06, so technically it expired last week!
I gonna contact the guys I bought it from and see if I can get them to send me a new can..