If you are working with watches, jewellery, or small-scale casting projects, recognising the right type of watch resin is essential to achieve clear, durable, and long-lasting results. This page will help you understand the key differences between epoxy and polyurethane resins, typical features to look for, and how to choose the most suitable resin for your use case—be it restoring timepieces, creating custom dials, or intricate moulding for accessories.

Watch Resin Types: Epoxy vs Polyurethane

There are two popular resin types encountered in watchmaking and restoration: epoxy resins and polyurethane casting resins. Epoxy resins are renowned for their high transparency, self-levelling glossy finish, and reliable scratch resistance—perfect for doming watch faces or preserving fine details in jewellery. In contrast, polyurethane resins are fast-curing and particularly valued for rapid prototyping and casting of small watch parts or components where time is critical and fine detail is crucial. The choice depends on your need for transparency, curing speed, resilience, and whether painting or colouring is required in the process.

Visual Comparison: Resin Types in Watchmaking

See side-by-side examples of domed epoxy finishes versus fast-set polyurethane castings commonly found in watch dials and resin-based components. Observing surface sheen, clarity, and thickness helps distinguish between types. Look for high-gloss, ultra-clear resin where light reflection is paramount and notice the rapid-hardening opaque effects of polyurethane when fine shaping is necessary.

“IWhite” – Polyurethane Casting Resin – White, Fast-Curing Two-Part System

The “IWhite” – Polyurethane Casting Resin – White, Fast-Curing Two-Part System is identifiable by its rapid curing (set in just 30 minutes), white opaque finish, and exceptional detail capture. This resin is commonly used for making prototypes of small watch components, mock-ups, and complex decorative watch parts. Polyurethane’s natural rigidity, excellent flow, and ability to be painted or coloured make it distinct from epoxy—if you see a cast part that is dry to the touch and crisp in form within the hour, it’s likely polyurethane like IWhite.

• Fast-setting for efficient prototyping and model creation
• Colourable and paintable in liquid or cured state
• Captures fine details for accurate casting results
• Durable finish after full cure

“Liquidissima” – Epoxy Resin For Creations & Jewellery

“Liquidissima” – Epoxy Resin For Creations & Jewellery stands out due to its remarkable transparency, longer working time, and low viscosity. This resin is particularly suited for intricate watch dials and protective domes, producing a crystal-clear finish that accentuates fine details. If your watch part has a glass-like finish with minimal air bubbles and was poured with enough time to manipulate, it is most likely an epoxy such as Liquidissima.

• High Transparency – Delivers a water-clear finish for detailed designs.
• Low Viscosity – Ensures excellent flow for complex moulds.
• Minimised Air Bubbles – Special formula reduces imperfections.
• Long Working Time – Ideal for elaborate jewellery or art projects.

“Icrystal” – Clear Epoxy Resin – Odourless Formula – Up to 1.5cm

“Icrystal” – Clear Epoxy Resin – Odourless Formula – Up to 1.5cm is another quality option for watch doming and surface coatings, especially when odour sensitivity or indoor application is a concern. It provides a truly crystal-clear result, impressive scratch resistance, and critical UV filtering to help prevent yellowing over time—a key test when assessing the longevity and clarity of watch coatings.

• Perfect transparency -> A true liquid crystal
• High scratch resistance -> Ideal for tables!
• UV filter for protection against yellowing -> 10 years warranty.
• Odourless and easy to use (2:1 mixing ratio)
• 1.5cm layer per pour

“Trasparente” – Multipurpose Clear Epoxy Resin for Casting – Up to 2cm

“Trasparente” – Multipurpose Clear Epoxy Resin for Casting – Up to 2cm offers an ultra-clear finish with the flexibility to cast up to 2cm in a single layer—perfect for larger decorative watch cases or memorial pieces. Its blend of high scratch resistance, integrated UV filter, and proven performance make it an excellent indicator of quality resin within crafted or restored watches.

• Ultra-clear formula for a crystal-clear, liquid finish
• High scratch resistance – ideal for tables and floors
• Integrated UV filter to protect against yellowing, backed by a 10-year warranty

How to Identify Quality Watch Resin: Tips and Surfaces

When inspecting a watch for its resin type, check for either a highly transparent, glass-like dome (indicative of epoxy) or a swift, opaque cast (suggesting polyurethane). Observe the curing time, scratch resistance, and whether the finish can be painted or coloured. Pay close attention to UV stability and yellowing over time—epoxy solutions like Icrystal and Trasparente excel here. For intricate, rigid white components, a polyurethane such as IWhite is likely the material in use.

Practical Tip: Testing Cured Resin for Recognition

Gently press or scratch a resin surface in an inconspicuous spot; epoxy typically resists marks and feels glassy, while polyurethane may be harder and ready within 30 minutes. A slightly warm residue or a distinct scent during curing are also clues—odourless options like Icrystal are preferable for sensitive users.