I use a digital scale the kind we use for postal work. I got mine from a scientific supply company. I use a volumatric flask to measure the exact volume of each (hardener or resin) and weight both. The ratio gives me a good base to calculate how much if I change the amount I use for mixing. It work out great.

: I tryed using raka 350 no blush hardner (with resin) on sat. I used there
: pumps. I made a bacth useng one pump of resin and one of hardner. After
: mixing for two minuts I added flour (cooking). I used this for filler on
: the white wood. Today the strip I used for mixing the epoxy still depresed
: with a fingernail. I made a test bacth last night using one pump of each
: again. This bacth I poured onto a large yogurt lid. Now 20 hrs. later It
: looks and feels like rubber! Is this just a bad bacth of epoxy or is this
: normal. Am I doing somthing wrong? I E-maild RAKA this morning and have
: not received an answer yet. I am planning on calling tomorrow.

: The temp has not been below 60 degrees.

: Any sugestions?

: Sage.