I am new to vacuum pressing and Unibond 800 two part glue. I was recommended to use a 10:1 mix ratio. I have a scale and not sure how to mix it. If I have 3.5 lb of resin how much hardener powder do I add and is it that critical? How do I do the math to figure out how much hardener to add?
From contributor J:
10:1 is an easy one to do in your head, which is as good a reason as any to use that ratio. The instructions suggest a range of anywhere from 7:1 (fast) to 12:1 (slow). There are 16 oz. in a pound. You've got 3.5 pounds of resin, which is 56 oz’s. Move the decimal one digit to the left, and you've got 5.6 oz’s, which is the amount of catalyst you're looking for. 3.5 pounds of resin, by the way, is a whole lot of glue. It seems unlikely that you'd want to catalyze it all at once.