FIBREGLASS & COMPOSITE SYSTEMS

Gelcoat & Flowcoats

Surface coat and protective layer for fibreglass laminates and repairs — MEKP-catalysed, available in clear and pigmented finishes.

RESIN CALCULATOR

Fibreglass Calculators

Use our fibreglass catalyst ratio calculator, resin quantity calculator, material coverage calculator and roll coverage calculator to estimate laminating materials.

Fibreglass Catalyst Ratio Calculator

Estimate MEKP catalyst required for polyester and vinyl ester resin in weight and volume.

General guidance only. Always follow the resin manufacturer’s Technical Data Sheet and Safety Data Sheet. Resin litre conversions are estimated using an assumed resin density of 1.1 kg/L.

Fibreglass Material Coverage Calculator

Estimate linear metres required from a 1.27 m wide roll, total reinforcement weight and approximate reinforcement volume.

Based on a standard 1.27 m wide fibreglass roll. Estimates do not include overlap, trimming waste or offcuts.

Fibreglass Resin Quantity Calculator

Estimate reinforcement weight, resin quantity in kg and litres, catalyst quantity, and total laminate materials.

General guidance only. Actual resin usage varies based on reinforcement type, technique, overlap, waste and laminate efficiency.

Fibreglass Roll Coverage Calculator

Estimate total area coverage, reinforcement weight and approximate reinforcement volume from a roll length using a 1.27 m roll width.

Based on a fixed fibreglass roll width of 1.27 m. Estimates do not include overlap, trimming waste or unusable offcuts.

Complete the laminate

Don't forget these essentials

Resin is one part of the laminate. The right catalyst, reinforcement and application tools all matter to get the finish right.

Curing

Catalysts & Hardeners

Required to properly cure polyester, vinyl ester and epoxy resin systems.

  • MEKP catalysts
  • Epoxy hardeners
  • Catalyst dispensers
Shop Catalysts
Reinforcement

Fibreglass Mat & Reinforcements

Reinforcement fibres provide the structural strength in composite laminates.

  • Chopped strand mat
  • Woven cloth
  • Composite fabrics
Shop Reinforcements
Application

Fibreglass Tools & Accessories

Application tools for clean laminating, mixing and reinforcement handling.

  • Laminating rollers
  • Mixing cups
  • Brushes & spreaders
Shop Tools

Frequently Asked Questions

What is the difference between gelcoat and flowcoat?
Gelcoat is typically sprayed or applied into a mould to create the finished outer surface of fibreglass parts, while flowcoat is a modified gelcoat designed for application onto exposed fibreglass surfaces during repairs or refinishing.
What are gelcoats used for?
Gelcoats are used to create a smooth protective outer layer on fibreglass and composite structures. They improve appearance while protecting the laminate from moisture, weathering and UV exposure.
When should flowcoat be used instead of gelcoat?
Flowcoat is commonly used for fibreglass repairs or coating exposed surfaces where a mould is not used. It cures to a hard surface that can be sanded and finished.
Can gelcoat and flowcoat be used for marine applications?
Yes. Both gelcoats and flowcoats are widely used in marine construction and boat repairs to protect fibreglass surfaces and restore damaged composite finishes.