We recommend using our epoxy within 6 months of purchase.
Store your epoxy resin and hardener at room temperature and keep it closed and in its original container to prevent contamination. With proper storage, resin and hardeners should remain usable for up to 6 months after opening. After lengthy storage, mix a small test batch to assure proper curing, before using.
Hardeners may darken with time, but physical properties are not affected by color. If clear finishing, be aware of a possible color change if very old and new hardeners are used on the same project.