Looking through some old posts, I found that Bob Perkins already told us this was the way to go.
I used a digital kitchen scale and measured by weight. NEVER a failed batch. Then just use plain old plastic cups from the super market. I used pumps for a while - but they tend to get clogged and gummed up over time.
I keep our scale in a plastic baggie so that it doesn't get covered in goo.... I actually use it in the kitchen.
It is much easier with 2:1 epoxy such as System 3. But if I used West - I would just print up a chart for the shop to do the math for me.
I often make 2-3 squirt batches. This is easiest with the digital scale.
I did make a 23' cold molded boat this way - so it works