Can you write out an example? I don't fully get it. Are you multiplying by 1.45 to get the total by WEIGHT which you then meet with the A side? Does the data sheet of your resin give the ratios by WEIGHT and VOLUME?I use condiment squeeze bottles that I buy at the dollar store to pour resins for small batches.
I measure by the gram into a (cheap) unmarked drinking cup ($4/50) sitting on a cheap digital kitchen scale ($20) and I do the math. Set the scale on grams instead of ounces. Set the empty cup on the scale and then zero it so that all you're measuring is the resin. Pour the B side then multiply by 1.45 to get the total, which you then meet by adding the A side. It works every single time. No guesswork or eyeballing involved.
I can do accurate epoxy mixes in any volume from ding sized batches and up. I've never once had a problem with my epoxy since I started measuring by weight. I typically reuse cups (after the previous batch has set up) so I don't even waste cups. I only mix what I think I will use, and my waste is down to maybe 4 oz per board.
The savings in waste and not having to use or clean the marked cups for measuring will pay for the costs of the scale in maybe just a couple boards. The most eco-friendly resin is the resin you save by not mixing more than you're using.
P.S. Use vinegar to clean up epoxy. Shelf life of epoxy is supposedly 6 months, (store in a cabinet or closed box to keep the sun off the container). If you are storing epoxy then crack the lid and vent the container every month or so. If it starts to coagulate at the bottom then stick the open container out in the sun to warm it up a bit and swoosh it around a little in the container to restore the viscosity.
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This, btw, is the best method I've seen.