Thanks Marika, your feedback is greatly appreciated. Each mould is different. We will be sharing a short video of how to measure how much casting resin for these moulds shortly. For this one it took about 90ml of clear casting which needs 30 drops of the Catalyst Hardener. We recommend that you check the mixing instruction below MIXING INSTRUCTION Wearing nitrile gloves and working in a well ventilated area, mix required amount of Catalyst and Resin. Recommended mix ratio at 25ºC is 10 drops of Catalyst to 30ml of Resin. a. Add 3 drops extra for each 5ºC decrease in temperature. b. Reduce by 3 drops for each 5ºC increase in temperature.*GUIDEONLY - FOR MORE INFORMATION VISIT WWW.PROTITE.COM.AU Not recommended for use below 10ºC. NOTE: Excess or over use of Catalyst will result in a shortened open time and Resin may cure too fast, overheat and crack.c. Mix thoroughly for a minimum of two minutes. Avoid entrapping air bubbles in the resin. Scrape sides and bottom of cup with stirring stick to ensure proper mixing of Resin and Catalyst.