Gelcoat

Isophthalic White Gelcoat

Premium-grade, pre-accelerated gelcoat for marine and FRP surface protection

This white isophthalic polyester gelcoat is formulated to deliver excellent UV resistance, weather durability, and surface gloss retention in demanding marine and industrial FRP applications. Based on isophthalic acid, this gelcoat offers a superior balance of mechanical strength and chemical resistance compared to orthophthalic options.

Designed for brush or spray application, it cures to form a high-gloss, durable surface layer that resists water ingress, chalking, and micro-cracking—ensuring long-term aesthetic and structural performance of FRP laminates. Ideal for boat hulls, panels, tanks, sanitary ware, and architectural composites, this product is optimised for New Zealand’s variable coastal climate with excellent UV stability and hydrolytic resistance.

Technical Snapshot (from TDS)

• Appearance: White pigmented, viscous liquid

• Viscosity: 7200 cps @ 25°C

• Acid Value: 16 mg KOH/g

• % Solid: 66.30%

• Gel Time: 8–17 minutes @ 25°C (with 1.5% MEKP & 0.3% Cobalt)

• Peak Exotherm: ~149°C
  
  

Key Features

• UV-stabilised for outdoor durability

• Water- and chemical-resistant outer layer

• Gloss-retentive with minimal surface chalking

• Crack and abrasion-resistant

• Fast gel and cure time for rapid production
  
  

Application Areas

• FRP boat hulls and decks

• Architectural domes and panels

• Sanitary ware, tanks, and containers

• Decorative claddings and façade elements

• Ideal for spray-up or hand lay-up processes
  
  

Curing & Use Conditions

• Best used between 20°C–30°C under low-humidity conditions

• Requires MEKP catalyst (1.5%) and Cobalt Octoate (0.3%) for ambient cure

• Apply in controlled lamination booths for optimal gloss and consistency
  
  

Packaging & Storage

• Available in 25 kg pails and 225 kg drums

• Store in sealed containers below 25°C, away from direct sunlight

• Shelf life: Up to 3 months from manufacture under proper storage