In-Mold Coating (IMC, Clear)
Key Features
- Superior scratch resistance (3H–5H pencil hardness) vs conventional gelcoat
- High gloss (≥90 GU at 60°) for premium surface finish
- Clear formulation for see-through or color-under applications
- Excellent chemical resistance to household and cleaning chemicals
- Applies directly into mold for zero secondary painting
This clear in-mold coating (IMC) is a solvent-borne or UV-cure topcoat applied directly into the mold cavity before lamination to provide a scratch-resistant, high-gloss clear protective surface on FRP parts immediately upon demolding. Unlike conventional gelcoats that are the structural outer surface, IMC systems are typically applied in a separate injection or flood coating step and cure against the mold to deliver automotive-class surface quality. The clear formulation allows the natural color of the substrate or underlying color coat to show through. Suitable for Class A automotive parts, bathtubs, shower enclosures, and high-end decorative FRP panels. Pencil hardness after cure is 3H–5H, significantly harder than conventional gelcoat. Chemical resistance to common household cleaners, cosmetics, and polishes is excellent. The IMC can incorporate UV stabilizers for outdoor applications. Apply by automated injection, flood coat, or manual spray into the closed or open mold at 80–120 µm dry film thickness.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Clear high-gloss liquid |
| Shelf Life | 12 months at 15–20°C |
| Gloss (60°) | ≥ 90 GU |
| Application Method | Spray, flood coat, or injection |
| Dry Film Thickness | 80–120 µm |
| Chemical Resistance | Excellent to household cleaners |
| Pencil Hardness (post-cure) | 3H–5H |
Applications
FAQ
In open mold processes, the IMC is sprayed or brushed into the mold at 80–120 µm dry film using the same equipment as conventional gelcoat, then allowed to cure partially (to a tack-free or B-stage state). The structural laminate is then applied directly over the IMC. Adhesion of the laminate to the IMC must be verified — some IMC systems require the laminate to be applied while the IMC is still at a specific tack stage to achieve bonding.
Direct Contact
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