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

: I finally searched the archives for 2 things -

: 1) How to make measuring cups. I feel like the Raka epoxy pumps
: make way more epoxy than I'd like.

: 2) What to do in this case (scrape + acetone for removal)