The problem with epoxy is that if you don’t blend exactly the right amounts of resin and hardener, it stays tacky and never reaches full strength. Instead of trying to guess at the volumes, I just use a food scale, set to grams. Use a disposable cup to hold the mixture. Set it on the scale, and be sure to zero the scale out. Now squeeze in, say, 10 grams of hardener. Add resin until you reach 20 grams, and you’ll know you have a perfect 50/50 ratio. Of course, the scale will work for any other ratio you need to make as well, if you do the math first.
-Doug Thalacker
Mt. Pleasant, Wisconsin
