Hello, im struggling to get my head around the mix ratio for the eproxy resin. On the containers, it says 100 - 30, is this measured by weight, or quantity? 

Let's say I wanted to use a small amount of resin for example 5 KG in weight? How do I work out how much harder to use? 

I have made a mixture and it's been drying for 24 hours, however its still tacky, im assuming I have not used enough hardner?