How do you prepare Liquid Mould silicone rubber?

Mixing the Silicone and Catalyst

Most liquid silicone rubbers for mould making come as two components: the base and a catalyst. Accurately measure both parts according to the manufacturer’s recommended ratio, typically 1:1 for products such as “Liquid Mould” – Casting Liquid Silicone Rubber, 5-40 Shores, Bi-Component A+B. Combine them in a clean container and stir thoroughly, scraping the sides and bottom, to ensure a homogenous mix. Incomplete mixing can lead to uneven curing and weak spots in the finished mould.

Pouring and Bubble Reduction

Once fully blended, promptly pour the silicone mixture over or around your prepared model. Pour slowly in a thin stream from a height to help release trapped air. For best results—particularly with intricate models—placing the filled mould in a pressure pot during the cure can significantly reduce air bubbles and improve surface detail. This is especially useful for capturing fine features common in clay cast projects.

Tips for Successful Mould Making

• Use mould release where necessary to prevent sticking.
• Work in a dust-free environment to keep your silicone and model clean.
• Be mindful of ambient temperature, as this can affect curing times.