Jesmonite AC730 Retarder Working Time Extender

With the Jesmonite Retarder, you can spend more time achieving that exact colour you were going for, or focus on the thorough mixing of your liquid and powder to eliminate air bubbles and powder clusters. It’s also great for more complex projects such as split pieces, where you might need to mix two separate colours that have to be poured at the same time. So, kick back, chill out and enjoy the process!

A little really does go a long way with Jesmonite’s Retarder. You literally only need to add 0.02% – 0.1% of your overall mix to slow down your set time, but bear in mind that the retarder will also slow down your set time when your Jesmonite is in the mould. This means you’ll need to leave your piece in the mould a little longer than usual for it to fully set.

Retarder is added to the pre-weighed liquids to extend the pot-life of the mixed material. Typical inclusion rates are 2g
– 8g, however a small test is recommended, as the precise timing is dependent on both temperature and mix size.

Jesmonite® is a Registered Trademark

We could talk about Jesmonite all day, but it’s important to note that the above information is based on a mixture of both our experience and Jesmonite’s official guidelines. We can’t guarantee that every piece you make will be perfect, but that’s the beauty of experimentation. If you have any questions about Jesmonite and its suitability for you, please don’t hesitate to get in touch.

For technical data check out our Knowledge Hub.