Best Resin Type for Sphere Casting: Clear & Bubble-Free Results

What is the Best Resin Type for Sphere Casting?

Achieving perfectly clear and vibrant resin spheres starts with choosing the right resin type. The type you select will directly affect the clarity, durability, and ease of your casting process.

Why Deep Pour Epoxy Resin is Preferred

For sphere casting, deep pour epoxy resin stands out due to its ability to cure slowly, reducing exothermic heat and minimising bubble formation. This results in a glass-like, crystal clear finish—which is exactly what most crafters and artists seek in a resin sphere. The slower cure also allows air bubbles to rise and escape before the resin sets, so you can achieve impressive clarity without complicated degassing techniques.

Choosing Resin for Your Project’s Size

The thickness of your sphere determines which resin is best. For projects up to 5cm thick, a resin like EpoxyTable 5-Five offers an ideal mix of clarity and flow, making it well suited for medium-sized castings. If you’re creating particularly large or thick spheres (up to 10cm), a product specifically designed for super-deep pours, such as “Epoxytable 10-Ten”, is a smart choice. Selecting a resin formulated for your intended casting depth ensures a bubble-free result and reduces the risk of overheating.

Practical Tips for Sphere Casting

Use a highly polished silicone mould to achieve a smooth surface without extra polishing.
Mix resin components thoroughly but gently to avoid introducing air bubbles.
Pour resin slowly into the mould and, if needed, apply gentle heat with a heat gun to pop bubbles at the surface.
Always monitor the curing temperature and unmould within the recommended time to avoid adhesion.

When This Matters

For artists, jewellers, or crafters who want spheres with flawless transparency for display, gifts, or inclusion in larger works, picking the correct deep pour resin is essential. Using standard fast-setting epoxy may result in internal bubbles and a cloudy finish, so these scenarios demand a purpose-made deep pour formula.

Related guides

Selecting the right deep pour epoxy resin is the foundation for beautiful, clear resin spheres. Explore further tips and project ideas in our complete guide to making a resin sphere.