Here is the simplest way to ensure perfect ratios every time when using a scale and it is just as quick as eyeballing volume. First get a digital scale and then tape a $1 calculator (I like the one with big buttons from office depot) to the wall next to the scale. This is based on Greenroom epoxy mix ratio of 44 to 100 by weight.
1) put your empty container on the scale and tare the scale. the reading will be 0
2) pour in your resin and take the the weight and enter into calculator. Say in this example it is 250 grams of resin.
3) multiply your resin weight by 0.44 so, 250 x 0.44 = 110 grams (or insert your epoxy choice's stoichiometry here)
4) without removing your resin container, tare your scale again. reading goes back to 0
5) add amount of hardener from calculator....in this case 110 grams.
6) mix well and a you get a perfect batch.
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