What’s the Difference Between IWhite and Polyform Casting Resins?

IWhite: For Paintable, Detailed Castings

IWhite is a white, fast-curing polyurethane casting resin specially formulated for precise model making and handcrafting. Its opaque white finish makes it ideal when you want to produce objects that are to be painted or decorated after curing. Not only does it cure rapidly—producing results you can demould in around 30 minutes—but it also faithfully captures intricate details from your silicone moulds. The cured surface accepts paint, making IWhite a preferred choice for model makers, hobbyists, and crafters looking for strong, customisable results.

• Paintable once cured
• Ideal for detailed figurines, prototypes, or miniatures
• Best when colour customisation is needed post-casting

Explore IWhite Casting Resin

Polyform: For Fast, Unpainted Prototypes

Polyform is a beige polyurethane casting resin designed for speed and practicality, perfect for rapid prototyping and model work where painting is not required. This resin sets in as little as five minutes and is ready to demould within half an hour, significantly reducing wait times for iterative prototype processes. However, unlike IWhite, Polyform is not intended for colouring or painting after curing, making it better suited for functional parts where finish and decoration aren’t your top priority.

• Fast curing for efficient batch work
• Beige finish intended for unpainted use
• Excellent for testing shapes, fittings or creating working models

Choosing the Right Resin

The main consideration lies in whether your final piece needs to be painted or colour-customised. If so, IWhite is the better fit due to its paintable white surface. If speed and a ready-to-use, natural beige finish are more important—such as when validating a design—Polyform is likely the best option. Both resins excel at filling fine details in quality silicone moulds and are suited for both professional and hobbyist environments.