What a great system and complete explanation! I'll start looking at digital scales...

: Hey Doug,

: I use a small digital scale I got on amazon. It's reliable,
: flexible. You only use one cup, no pump worries. You never have
: to worry about reading a meniscus again!

: First make a chart in Excel of the ratios.
: Example West 105 resin and slow hardener 207
: column 1 range of resin weights, grams, ounces
: column 2, calc Hardener (=resin/3.7)
: column 3 Calc total = Resin + hardener

: Zero out the scale with the empty cup you want to mix in.

: Pour in the amount of resin that you want--no measuring needed
: unless you want to.

: Note the weight. check the chart. Then add Hardener until the scale
: reads the correct final amount.
: The chart covers you even if the digital scale turns off before you
: add the hardener. In this situation just zero out the scale with
: filled resin cup, add Hardener until it reads only the Hardener
: weight.

: I've been using this method for everything from re-coating my hull,
: to tiny little repair amounts. (I usually keep a piece of wax
: paper or saran wrap to protect the scale, but they only cost
: $12)

: WEST Epoxy
: Slow Hardener 207 Resin 105
: 3.7 : 1 by weight
: 105 207
: Resin Hardener Total
: 0.4 0.11 0.51
: 0.5 0.14 0.64
: 0.6 0.16 0.76
: 0.7 0.19 0.89
: 0.8 0.22 1.02
: 0.9 0.24 1.14
: 1 0.27 1.27
: 1.1 0.30 1.40
: 1.2 0.32 1.52
: 1.3 0.35 1.65
: 1.4 0.38 1.78
: 1.5 0.41 1.91
: 1.6 0.43 2.03
: 1.7 0.46 2.16
: 1.8 0.49 2.29
: 1.9 0.51 2.41
: 2 0.54 2.54