Jesmonite Retarder is an additive that can be mixed with Jesmonite liquid resin to extend the setting time of the composite material. This allows for more working time and greater control over the curing process. There are different types of Jesmonite Retarder, one is compatible with Jesmonite AC100 and a separate one is for cement-based Jesmonite AC730, so it is important to select the correct retarder compatible for the material that you are working on.
The retarder can be added to the pre-weighed liquids to extend the pot-life of the mixed material. Typical inclusion rates are between 2g-8g per kilogram of mix, but it is recommended to perform a small test as the precise timing is dependent on both temperature and mix size. A 2% addition will make the set time approximately 25-30 minutes. However, it's important to note that set times can be affected by factors such as temperature and humidity, so it is recommended to perform tests in the specific workshop environment.
Step 1: Measure out the appropriate amount of Jesmonite AC730 liquid and base according to the manufacturer's instructions, which is 5 parts liquid to 1 part base.
Step 2: Determine the desired setting time and add the appropriate amount of Jesmonite AC730 Retarder. The typical inclusion rate is between 2-8 grams per kilogram of mix, but it is recommended to perform a small test as the precise timing is dependent on both temperature and mix size.
Step 3: Mix the Jesmonite Retarder thoroughly into the liquid component.
Step 4: Mix the base component with the liquid component and retarder mixture
Step 5: Pour the mixture into the mold or form and smooth the surface.
Step 6: Allow the mixture to cure according to the manufacturer's instructions or the desired setting time.
Step 7: Once cured, remove the cast from the mold and finish as desired.