Crystic® Flowcoat
Spray Gelcoat TC 507 PA

Product info

Crystic® TC 507 PA

Water & Chemical Resistant IsoNPG Brush Topcoat

Crystic® TC 507 PA is a high-performance IsoNPG topcoat formulated for brush or roller application where durable surface protection, water resistance, and chemical resistance are required. Pre-accelerated for ease of use, this topcoat delivers excellent opacity, even film build, and minimal sag, producing consistent, high-quality finishes.

Designed primarily as a finishing coat, Crystic® TC 507 PA is ideal for applications where the rear or exposed surface of a laminate requires long-term protection from water or mild chemical attack. It is widely used in GRP lined swimming pools, as well as industrial and marine composite structures requiring a robust, protective top layer.

Key Features & Benefits

IsoNPG resin base

Excellent resistance to water, UV exposure, and mild chemical environmentsutdoor exposure

Optimised viscosity profile

Even coverage with minimal sagging and excellent opacity

Easy brush or roller application

Controlled application on vertical and complex surfaces

Durable protective finish

Ideal for exposed laminate backs and non-moulded surfaces

High surface hardness

Produces a tough, wear-resistant finish

Applications

Crystic® TC 507 PA is recommended for:

GRP lined swimming pools
Protective finishing coats for the back of laminates
Marine composite structures
Areas requiring durable water-resistant topcoats
Industrial composite components
Protection against moisture and mild chemical exposure
Exposed laminate surfaces
Where cosmetic appearance and durability are required

Properties (Uncured)

Viscosity (ICI Cone & Plate @ 25°C): ~14 poise
Viscosity (Brookfield SP5 @ 2.5 rpm): ~45,000 mPa·s
Viscosity (Brookfield SP5 @ 20 rpm): ~10,000 mPa·s
Gel Time @ 25°C:
- ~15 min with 2.0% Butanox® M50
- ~25 min with 1.0% Butanox® M50
Specific Gravity @ 25°C: ~1.2

Properties (Cured)

(Post cure applied)

Barcol Hardness: ~49
Water Absorption (24 hrs @ 23°C): ~16 mg
Heat Deflection Temperature (HDT): ~96°C
Tensile Strength: ~57 MPa
Tensile Modulus: ~3.9 GPa
Elongation at Break: ~1.6%

Processing & Application

Crystic® TC 507 PA is pre-accelerated and designed for brush or roller application.

Recommended application temperature: 18–25°C
Catalyst: 1–2% medium-reactivity MEKP (e.g. Butanox® M50)
Recommended wet film thickness: 500–800 microns

Important application notes:

Apply only to fully cured, clean laminates
Older laminates (>1 week) may require light abrasion prior to application
Do not use as an in-mould gelcoat
Post curing is recommended to achieve optimum water, chemical, and heat resistance

Packaging & Storage

- Packaging:
  - Natural – 20 kg pail
  - White – 25 kg pail
- Storage:
  Store between 5°C and 25°C in original, unopened containers in a dry, well-ventilated area. Protect from freezing and direct sunlight.
  Shelf life up to 5 months when stored correctly.
ATL Technical Support
ATL Composites provides local technical support, application guidance, and system selection advice to ensure Crystic® TC 507 PA delivers reliable protection and long-term performance in demanding composite environments.

Crystic® Flowcoat TC 507 PA

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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