Crystic® Isophthalic
Spray Gelcoat LS 97PA

Product info

Crystic® Gelcoat LS 97PA

Exceptional Weathering Isophthalic Spray Gelcoat

Crystic® Gelcoat LS 97PA is a high-performance isophthalic spray gelcoat developed for applications where long-term weathering performance, gloss retention, and colour stability are critical. Engineered to outperform conventional isophthalic gelcoats, LS 97PA exhibits minimal colour change and superior gloss retention in demanding outdoor environments.

Pre-accelerated and formulated for spray application, this gelcoat delivers excellent flow, even film build, and low porosity, resulting in smooth, high-quality cosmetic surfaces. Its intrinsic water and blister resistance, combined with low styrene emission, makes it suitable for use across marine, transport, building, and general moulding applications.

Crystic® Gelcoat LS 97PA is approved by Lloyd’s Register of Shipping, confirming its suitability for marine environments where surface durability and appearance are critical.

Key Features & Benefits

Outstanding weathering performance

Superior gloss retention and low colour change in outdoor exposure

Isophthalic resin base

Excellent water resistance and reduced blistering risk

Low styrene emission formulation

Reduced environmental impact and improved workplace conditions

Optimised spray viscosity profile

Even coverage with minimal drainage and low film porosity

High elongation characteristics

Good impact resistance and surface durability

Lloyd’s Register approved

Proven performance in marine applications

Applications

Crystic® Gelcoat LS 97PA is recommended for:

Marine mouldings
Hulls, decks, and components requiring long-term gloss and colour stability
Transport & automotive components
Architectural & building mouldings
General composite mouldings
Where weathering performance is critical
High-visibility outdoor composite components

Properties (Uncured)

Viscosity @ 25°C: ~250 poise
Specific Gravity @ 25°C: ~1.2
Recommended Application Temperature: 15–25°C

Properties (Cured)

(Post cure applied)

Tensile Strength: ~74 MPa
Elongation at Break: ~4.7%
Barcol Hardness: ~36
Flexural Strength: ~110 MPa
Flexural Modulus: ~2800 MPa
Heat Deflection Temperature (HDT): ~63°C

Processing & Application

Crystic® Gelcoat LS 97PA is pre-accelerated and designed for spray application.

Recommended catalyst: 2% Butanox® M-50 or equivalent
Recommended wet film thickness: 600–800 microns
Spray temperature: 15–25°C

Apply using controlled spray passes to build film thickness gradually and ensure consistent surface quality. Post curing is recommended to achieve optimum weathering, mechanical, and water-resistance performance prior to placing parts into service.

Packaging & Storage

- Packaging:
  - Natural – 20 kg pail
  - White – 25 kg pail
- Storage:
  Store in original, sealed containers under cover and out of direct sunlight.
  Recommended storage temperature below 25°C.
  Product must not be frozen.
ATL Technical Support
ATL Composites provides local technical support, spray setup guidance, and surface finish optimisation advice to help ensure Crystic® Gelcoat LS 97PA delivers consistent cosmetic and long-term performance.

Crystic® Gelcoat LS 97PA

frequently asked questions

How does ATL tailor composite systems for different industries?

Every industry has distinct performance, compliance, and manufacturing requirements. ATL’s in-house chemists and engineers develop and refine epoxy systems, adhesives, and core materials to meet the specific demands of marine, defence, aerospace, automotive, industrial, civil, architectural, and sporting applications — ensuring every product delivers optimal strength, efficiency, and durability.

Can ATL customise materials for my project or process?

Yes. ATL offers custom formulation and process engineering support to align material performance with your production requirements — whether infusion, hand lay-up, lamination, bonding, or CNC-routed panel construction. Our technical team collaborates closely with customers to deliver precision-matched resin systems and structural solutions for unique applications.

Are ATL’s composite systems certified for high-performance applications?

Absolutely. ATL operates under an ISO 9001:2015-certified quality management system, with selected materials approved by DNV for use in structural and high-load applications. Every ATL system is manufactured to exacting standards of performance, consistency, and traceability to meet the demands of defence, industrial, and advanced engineering environments.

What makes ATL’s materials suitable for large-scale or structural builds?

ATL’s epoxy systems, structural panels, and composite cores are engineered for high strength-to-weight performance, dimensional stability, and fatigue resistance. These attributes make ATL materials ideal for large composite assemblies, modular structures, and precision-engineered components where long-term strength, weight reduction, and reliability are essential.

Does ATL offer sustainable or bio-based composite options?

Yes. ATL is committed to advancing sustainable composite technology, offering USDA-Certified Bio-Based epoxy systems and environmentally conscious materials that reduce waste, extend service life, and minimise environmental impact. Our ongoing R&D focuses on improving sustainability without compromising structural integrity or mechanical performance.

How can I select the right ATL system for my application?

Choosing the ideal composite system depends on your structure’s design, load requirements, manufacturing process, and environmental exposure. ATL’s in-house engineers and chemists provide tailored advice to ensure the correct combination of resin, core, adhesive, and surface technology for your project.
To discuss your application or request technical guidance, contact ATL’s Technical Team — we’ll help you identify the most effective and efficient composite solution for your build.

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