How to Demould and Finish Your Resin Fish Casting

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After your resin fish casting has cured, taking care in demoulding and finishing helps you achieve a professional, crystal-clear appearance. Here’s how to safely release your piece and polish it to perfection.

Demoulding Your Resin Casting

Once you are certain the resin has fully cured—a process that depends on the type and thickness of resin used—it’s time to remove the cast from the mould. Begin by gently flexing the mould to loosen the edges. If a release agent was used, it should help, but work slowly to avoid cracking delicates like embedded fish specimens. Avoid sharp tools, as they can scratch the resin or damage details.

If you are using deep pour products such as Epoxytable 10-Ten, ensure the deep section is completely set before attempting removal. Patience at this stage prevents warping and marks.

Sanding and Polishing for a Pristine Finish

After demoulding, some surfaces may feel uneven or bear slight marks from the mould. Begin sanding with a fine-grit sandpaper, gradually moving to higher grits for smoother results. It’s best to wet-sand to minimise scratches and dust. Continue until the surface feels smooth to the touch. Finish with a suitable resin polish and a soft cloth or polishing pad, buffing the piece to a glass-like shine. This process enhances the clarity so the embedded fish displays at its best.

When This Matters Most

Careful demoulding and meticulous polishing are especially important for display or commemorative projects, where clarity and finish are crucial. If you plan to showcase your casting or give it as a gift, spending time on the finishing steps will be well worth the effort.

Related guides

How To Embed A Dead Fish In Resin

Following these methods will help your resin-embedded fish look its best—clear, bright, and beautifully presented. For more detailed advice on the entire embedding process, explore our full guide on how to embed a dead fish in resin.