Call the vendor; epoxy is epoxy is epoxy, but the hardeners are what are different from one to the next. I will tell you that I eyeball 2:1 for small stuff and I know I am off a bit sometimes and it has taken longer than it should, but I have never had to redo. But multiple coats of resin without enough hardener I am not as sure about. Call the vendor of the hardener.
Newport 17 - "Kohanna"
At sea Darwin's hypotheses is the final arbiter of right of way.