If you invest in a small gram/grain digital scale , the kind used for reloading ammo (I own a PACT) you will never have another mixing ratio problem again.
You will find other uses for it too like weighing hooks or whatever. They really are a worthwile investment, plus the peace of mind that you will never mix another bad batch & ruin another plug.
Part B is typically 15%lighter than part A(weight vs volume) . Once you write the correct ratios down you can easily get the accuracy to within a drop. I start with part A (dont forget to set the tare weight for the cup) write this down, then pour part B over it to get to desired total weight. Simple, and very accurate.
just my .02
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