Why can’t you change the resin mixing ratio?

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When working with epoxy resin, the temptation to alter the A + B mixing ratio can be strong—especially if you want faster curing, a thicker layer, or think you might get a better finish. However, there are important reasons for always following the recommended proportions.

The Science of Mixing Ratios

Epoxy resins cure through a chemical reaction between the resin (A) and hardener (B). These components are formulated to work together in a specific ratio—such as 3:2, 100:55, or 100:60 by weight—set by the manufacturer. When you deviate from this proportion, the parts cannot fully react, leading to incomplete curing and a softer or tacky result.

• Too much hardener: Leaves unreacted hardener, often causing stickiness or cloudiness.
• Too much resin: Prevents hardening altogether, making the surface weak and easily marked.

Practical Results of Incorrect Ratios

Changing the mixing ratio can greatly affect both the look and the performance of your finished piece. You’re likely to see issues such as cloudiness, surface tackiness, or reduced strength—problems that are difficult, if not impossible, to correct after pouring. For example, using a trusted product like the Art Pro Clear Epoxy Resin in its precise 3:2 ratio ensures your artwork dries with a durable, glass-like finish every time.

When This Really Matters

Sticking to the correct mixing ratio is especially essential for durable coatings, tabletops, or jewellery—any project where a tough, scratch-resistant, and crystal-clear result is needed. If you’re creating statement pieces where clarity and longevity are priorities, using the right proportions will prevent disappointment.

Related products

• "Art Pro" – Clear Epoxy Resin for Artists and Surface Coating
• "EpoxyTable 5-Five" – Deep Pour Epoxy Resin for Tables and Large Projects – Up to 5cm
• "Trasparente" – Multipurpose Clear Epoxy Resin for Casting – Up to 2cm

Related guides

• Can I Change The A B Mixing Ratio

While it can be tempting to experiment, always follow the precise mix recommended for your resin. This way, you’ll achieve reliable, long-lasting results—whether you are coating artwork, casting a table, or crafting jewellery. For further advice on resin projects, see our main guide on A + B mixing ratios.