When it comes to mixing epoxy, sometimes you need gallons and other times you need just a wee dram. When we were making the bullet-proof cabin top and doing the fairing work on the cabin top, topsides, and hull, we mixed it up by the gallon, and buckets calibrated in pints/500ml increments were fine. But at the other end of the spectrum, when you’re just doing a little glue up, little cups calibrated in everything from teaspoons, tablespoons and ounces to milliliters (and, yes, even drams) worked out pretty well. But with the smaller quantities, the accuracy of the ratio of resin to hardener becomes that much more critical because you’re working with such small volumes. What to do, what to do…
Enter the jewelry scale.
I was using 5:1 West System epoxy for the pic above, so all I had to do was add 20.0 grams of hardener for the perfect ratio. Since I got this scale and am no longer doing big epoxy jobs, I use it for just about everything. It turns out that the pumps that are commonly used with epoxy have ~4% variation in delivered product. I still use the pumps to deliver resin and hardener into the cup on the scale because they’re cleaner. But I rely on the scale for accuracy. And the old oz, tspn, dram, CC cups I was using cost $3 for 50, and I went through lots of them. For $9 online, this thing is a steal!
Next up in our 1969 Chris Craft Roamer 46 Refit: Props