Etex Equation or Amounts by Weight

[VTBasser]

Going to take the Etex plunge since Waldo cut off our supply of inexpensive Devcon.

Reading many horror stories of sticky results I was thinking about mixing amounts by weight; thinking for small amounts weight would be more accurate than volume.

Has anyone else done this?

Is there any reason to pour the resin or hardner first?

I am planning to use one mixing cup. Weigh the cup; add the weight of one to the weight of the cup and pour to that weight; then add the weight of the other and pour to that weight.

Below are my calculations to do it. I think I got them right.