John,

I understand what you are saying. There are only two things that generally effect the cure time of epoxies other than the resin and its respective hardner which are temperature and mass. If you mix up a fair amount of material even a half ounce in a mixing cup it will cure faster vs being mixed on a flat surface where it can be spread out. More mass, more heat generated in the reaction. If your working enviroment is warm your material will cure faster than if its cold. Below about 55 degrees F most epoxies go almost into remission taking practically forever to cure until the temperature comes backup. About 75-80 degrees is a good working temperature for most applications.

Another thing we don't know is what the potlife benchmark is based upon for your brand of 30 minute epoxy. Is it a 30 minute cure or or a 30 minute potlife(working time)? We generally base our times on a 100 gram mass at 77 degrees F. Anything different than those parameters the potlife and cure time changes.

Hope that helps

Steve