What is the difference between polyurethane and epoxy resin?

Curing Time and Handling

Polyurethane resins, such as the IWhite Polyurethane Casting Resin, are best known for their rapid curing. These resins often set within minutes and can typically be demoulded in half an hour, making them ideal for those who need quick turnaround or rapid prototyping. Epoxy resins, by contrast, have a longer working time which gives you more flexibility to adjust, sculpt, and ensure a bubble-free pour—especially useful for artistic or intricate creations.

Finish and Clarity

Epoxy resins, like Liquidissima, stand out for their exceptional clarity and smooth finish. This makes them the preferred choice for projects where a transparent or highly detailed surface is needed, such as jewellery or clear figurine moulding. Polyurethane, on the other hand, is typically opaque and available in neutral colours such as white or beige. Its high fluidity helps it fill fine details, but it won’t have the same glass-like look as epoxy.

Choosing the Right Resin for Your Project

• If you need speed and fine detail, choose polyurethane like Polyform for prototyping, hobby models, or small manufacturing runs.
• If clarity, a long working time, or a flawless surface are key, epoxy resin is your go-to for jewellery, transparent effects, or decorative elements.
• Always check the recommended application thickness and handling notes on individual products, and wear suitable protective equipment during mixing.