We don't make those products for Redford, but one of our friends does. So, we are familiar with thier products. The 100% solids material has a listed shelf life of only 1 year... BUT... As long as the containers are sealed it should last MUCH longer... maybe even 5-10 years! So, I wouldn't worry about that too much. If it is old material... MAKE SURE you stir both components INDIVIDUALLY BEFORE mixing them together.
Also, they have a few different primers that they use... if you got the epoxy emulsion you should store it indoors somewhere where it won't freeze. The urethane should probable be kept from freezing as well. Again, just maker sure that before you use these that you've made sure that nothing is settled on the bottom of the cans.