Using casting rubber primarily involves applying layers to an original object to create a flexible mould. This mould can then be used to reproduce the original form.
For effective moulding results, the process typically involves applying multiple layers of the casting rubber directly onto the item you wish to duplicate. Once these layers have dried completely, the resulting flexible rubber form can be carefully peeled away from the original object. This rubber shell then serves as your mould, ready to be filled with a casting material like resin, plaster, or wax to create a copy.
The Process of Using Casting Rubber
Based on common practices and insights, using casting rubber to create a flexible mould follows a specific sequence of steps to ensure a successful outcome.
Step 1: Prepare the Original
Before applying the casting rubber, ensure your original object is clean, dry, and free from any debris. Depending on the material of the original and the casting rubber, you might need to apply a release agent to prevent the rubber from sticking permanently.
Step 2: Apply the Casting Rubber Layers
This is a crucial step for creating a durable and effective mould.
- Application: Apply the casting rubber directly onto the surface of your original object.
- Layering: As highlighted in moulding guidelines, for best results, it is recommended to apply 7-10 layers of Casting Rubber to the original. Building up multiple layers ensures the mould has sufficient thickness and strength.
- Drying Between Layers: Allow each layer to dry or cure according to the product's instructions before applying the next. This prevents trapping moisture and ensures each layer bonds correctly.
Step 3: Allow for Complete Drying
Once the recommended number of layers (e.g., 7-10 layers) has been applied, the entire rubber coating must be allowed to fully dry or cure. The drying time can vary significantly depending on the specific type of casting rubber, the thickness of the layers, and environmental conditions like temperature and humidity. Refer to the product's instructions for accurate drying times.
Step 4: Peel Off the Mould
Once the casting rubber layer(s) has dried, you will be able to peel it off of the original. Because the rubber is flexible, it can usually be carefully stretched and removed from the object without damaging either the mould or the original.
Step 5: Fill the Mould
With the flexible rubber mould now separated from the original, it is ready to be used for casting. You can fill the mould with your chosen moulding product. Common materials include:
- Resin
- Plaster
- Wax
- Soap bases
- Concrete
Allow the casting material to cure within the mould before demoulding your new copy.
Using casting rubber is a popular method for reproducing intricate shapes and details due to the flexibility of the resulting mould.
