The Part B hardener has gotten darker over time. Can I still use it?

Probably. Hardeners yellow and darken over time due to contact with air and sunlight. This does not affect their performance. If the batch date is older than 3 years, to satisfy yourself do a small test and make sure it cures properly.  Batch code: X(YEAR) XX(MONTH) XX(DAY) X (INTERNAL CODE).

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