Do Two-Component Resins Mix by Weight or Volume?

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Mixing ratios are essential for getting the best performance from two-component resins. Whether you’re using epoxy, polyurethane, or other resin types, understanding the right way to measure ensures consistent results and minimises risk of curing failures.

Mixing by Weight vs. Volume: What’s the Difference?

Most two-part resins require precise proportions of resin and hardener to achieve proper curing. Many epoxy resins specify ratios by weight—meaning you’ll need digital scales for accuracy. Others, like the One-2-One epoxy resin, are designed for easier handling and mix 1:1 by volume, making it more accessible for crafting and hobby projects. Polyurethane casting resins may also call for either weight or volume mixing, depending on the brand and formulation.

Best Practices for Accurate Mixing

• Read the label first: Check the packaging or technical sheet for the exact mixing instructions before starting.
• Use suitable tools: If required by weight, a digital scale is a must; for volume, use marked mixing cups for precise pours.
• Combine thoroughly: Scrape sides and bottom of the mixing vessel to ensure even blending—improper mixing can lead to tacky spots or soft cures.

When This Matters Most

Mixing ratios are particularly critical for clear art resins, jewellery work, and casting applications where surface finish and cure strength matter. Even experienced users can run into problems if measurements are off, so following the resin manufacturer’s instructions is always best practice.

Related products

• "One-2-One" – Epoxy Resin for Handcraft, 1:1 Mixing Ratio
• "Icrystal" – Clear Epoxy Resin – Odourless Formula – Up to 1.5cm
• “IWhite” – Polyurethane Casting Resin – White, Fast-Curing Two-Part System

Related guides

• Who Produces Two Component Resin In China

Getting the mix right—whether by weight or by volume—makes all the difference for two-component resins. For more on brands, sourcing, and resin types, explore our main page on who produces two-component resin in China.