EPIKOTE GT 30 / GT 35 Gelcoat System

EPIKOTE™ MGS® GRT 30 / GRT 35 Gelcoat System

EPIKOTE™ MGS® GRT 30 and GRT 35 are high-performance gelcoat systems designed to deliver durable, high-quality surface finishes for composite parts. Suitable as both gelcoat (pregel) and topcoat, these systems are compatible with polyester and many epoxy laminating resins, making them a versatile solution across a wide range of applications.

Engineered for professional composite manufacturing, these gelcoats provide excellent surface properties, easy processing, and reliable curing performance. With a non-tacky, satin finish and paraffin-free formulation, they ensure strong adhesion and consistent results in demanding environments.

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Key Features

• Suitable for gelcoat, undercoat, and topcoat applications
• Compatible with polyester and epoxy laminates
• Non-tacky, satin finish (paraffin-free formulation)
• Easy application by spray, brush, or roller
• Fast curing with consistent surface quality
• Thixotropic properties allow vertical application up to ~0.5 mm thickness

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GRT 30 vs GRT 35

GRT 30

• Highly light and weather resistant
• Extremely scratch-resistant surface
• Available in white and transparent (ideal for tinting)
• Best suited where maximum surface durability is required

GRT 35

• Developed for high-performance applications (including aerospace)
• Excellent elongation and flexibility
• Superior working properties
• Available in white finish

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Processing Overview

• Pot life: ~30–45 minutes
• Gel time: ~100–150 minutes
• Touch dry (non-tacky): 2–4 hours
• Full cure: 2–3 days at room temperature
• Optimal processing temperature: 20–25°C

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Typical Applications

• Composite moulding and tooling
• Marine and automotive finishes
• Aerospace components (GRT 35)
• Protective and cosmetic surface coatings