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Ensuring that your silicone has fully cured is a crucial step in making erasers or any silicone moulded item. Skipping or rushing this stage can lead to poor results and a less durable end product.
Why Full Curing Matters
During the curing process, silicone transitions from a liquid or pliable state to a stable, solid form. When making erasers, allowing adequate curing time ensures the mould sets completely and the finished eraser holds its shape, texture, and usability. Incomplete curing may result in tackiness, distortion, or breakage when removing the eraser from the mould.
Recommended Curing Times and Conditions
Curing times can vary depending on the silicone product you’re using. For example, products like “Liquid Mould” Casting Liquid Silicone Rubber typically require around 10–12 hours to fully cure, especially for intricate moulds. Translucent silicones and putties might cure faster, such as 3–8 hours for some platinum-based rubbers or 20–40 minutes for certain silicone putties. For best results, maintain a stable room temperature and avoid excessive humidity.
Practical Curing Tips for Eraser Makers
- Always follow the manufacturer’s recommended mixing ratios and curing times.
- If available, consider using a pressure pot to help remove any air bubbles before curing begins, ensuring a smooth finish.
- Do not demould or handle the silicone before it has fully cured—impatience can cause unwanted warping or marks.
- Test a small section before removing the entire piece to confirm that it has set throughout.
When Full Curing Is Especially Important
Allowing full curing is vital when making erasers with detailed or deep moulds, or when you need your final product to withstand repeat use. Skipping this step makes silicone erasers prone to damage, which is especially significant for bespoke or complex designs.
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Taking the time to let your silicone fully cure pays off in the quality and durability of your finished erasers. For more guidance and steps on creating custom erasers, see our comprehensive guide on how to make an eraser using silicone.