Quote Originally Posted by jbl View Post
Does anyone have any idea how long the Part C is good for once it's opened? Sebastian's post above seems to say 2-3 years, but are you saying that's 2-3 years until opened?

I don't know how long it is completely good for, but I mixed a partial batch last September then mixed new chems from the same concentrates this past May. I kept them in the fridge tightly closed. I'm getting good results from my current batch of chems.