I have always used the cups with the graduations in them. I had not had a problem until that batch of 30 min. You usually only have to be close to even to get good results. You can't believe the number of Navy aircraft I have used 2 part epoxy on with success. This stuff was just funny. Its' just 6 or 8 bucks worth of epoxy, I have 3 or 4 hundred worth of electronics and motor riding on it. I just pitched it as a freak thing.