Do I Mix Resin and Hardener by Weight or by Volume?

Mixing Methods: Weight vs Volume

Epoxy resins may be mixed either by weight or by volume, depending on the product you are using. Some resins, like One-2-One, are designed for easy measuring with a 1:1 ratio by volume—simply combine equal parts of each component in a measuring jug. Other products require measurements by weight, such as 100:55 or 100:60 ratios, which are best handled with a precise digital scale to ensure accuracy. Reading your resin’s packaging or included instructions is essential to determine which approach to use.

Practical Guidance for Measuring

Before starting your project, set out your measuring tools: a clean jug for volume ratios, or a well-calibrated scale for weight ratios. For 1:1 volume resins, pour equal amounts of resin and hardener into your container. For resins with ratios like 100:55 (for example, 100 parts resin to 55 parts hardener by weight), always use a scale. Mixing by the wrong method can result in cloudy finishes or incomplete curing, so follow the manufacturer’s advice closely.

• Consult your product’s technical sheet or label
• Double-check measurements before combining chemicals
• Stir thoroughly to achieve a consistent blend

When Accuracy Matters Most

Mixing by the right method is particularly important for large projects, deep pours, or items exposed to regular use, such as table tops. Inaccurately measured resin and hardener can lead to sticky surfaces or brittle castings. If in doubt, contact the supplier for clarification before proceeding.