Sizes, and storing it properly
Updated
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The range we hold
From 100 ml to about 4.7 liters. The small end suits decanting a working quantity to the bench; the large end suits bulk storage of a product you go through. Decanting from a large container into a small working one is good practice, and it is the point at which labeling becomes your responsibility.
Hardener is the one that ages
Amine hardeners absorb moisture and carbon dioxide from air, and a part-used container that has been opened repeatedly loses activity. Buying the hardener in a size you will finish, even when the resin comes larger, is the sensible asymmetry.
Date it when you open it
Not when you bought it. A pen mark on the shoulder takes a second and it is the only way to answer the "is this still good" question that produces an unexplained failed cure months later.
Store the two parts apart
A leak that lets resin and hardener meet in a storage cabinet is a reaction in a confined space with nobody watching it. Separate shelves, or separate trays, is a small discipline against an unlikely but serious event.
Cold is a storage problem, not just a cure problem
Some resins crystallize or thicken in a cold store and need warming before use. An unheated garage in winter affects your material before it ever affects your pour, which surprises people who warm the workshop but not the shelf.
Secondary containment is worth the tray
A drip tray under stored chemicals turns a split container from a workshop incident into a contained one. It is the cheapest thing on this page and the one most often missing.
Keep the original container even after decanting
It carries the batch, the hazard information and the manufacturer details, and those are what you need if something goes wrong or if you have to reorder the same thing. Decanting is not a reason to discard the label.