Video Demo: Mixing and Pouring Silicone Moulds

Watch a quick demonstration of mixing a 1:1 ratio of translucent silicone rubber and pouring it around a model to see the bubble-minimising technique in action. This visual guide highlights proper mixing, safe handling and pouring methods for optimal detail reproduction.

Step 1: Prepare Your Model and Workspace

Start by ensuring your model—whether it’s a 3D print or hand-sculpted piece—is clean and free of dust or grease. This prevents flaws in your final mould. Place your model on a flat surface within a suitable containment, such as a mould box or frame, allowing space around all sides to form a solid silicone wall.

If your model has small layer lines from 3D printing, consider coating it with a layer of “3D Finish” – Fast Coating Epoxy Resin for 3D Prints to smooth the surface and enhance detail transfer.

Work in a tidy, well-ventilated space and cover your surfaces. Gather all tools and wear gloves to keep everything clean and safe.

Step 3: Cure and Demould Safely

Allow your silicone or putty to cure fully. Curing times vary: translucent silicone rubber sets in roughly 3-8 hours, while non-toxic putty firms up in around 20 minutes. Follow package guidelines, and do not rush this stage for best detail reproduction. Keep your workspace undisturbed during curing to avoid warping or imperfections.

Once cured, carefully disassemble your mould box or remove the putty, gently separating the mould from the model. If necessary, use a release agent for complex or delicate items to aid demoulding without tearing the mould.

Tips and Troubleshooting for Mould Making

Always measure your silicone or putty accurately. Even slight variations can affect the curing and durability of your mould.

Work in a well-ventilated area and wear protective gloves. Some resins and silicones can irritate the skin or produce odours.

Poor mould release can often be traced to skipping the release agent, especially with models that have intricate details or contrasting materials. Properly release the model before pouring resin to prevent sticking.

If bubbles appear in the finished mould, it’s usually due to fast or aggressive mixing. Remove air bubbles for a flawless mould finish.

Storing silicone moulds away from heat and sunlight can greatly extend their lifespan and performance for repetitive casting projects.

Gallery: Successes and Common Pitfalls in Mould Making

Explore side-by-side images showing crisp, bubble-free moulds and common mistakes such as air pockets, torn edges or incomplete curing. Study these examples to perfect your own resin mould making process and troubleshoot issues as they arise.