Altex Epoxy Barrier Undercoat (2-Pack) – 1.25L

The Altex Epoxy Barrier Undercoat (2-Pack) 1.25L is a high-performance, sandable epoxy high-build coating designed to provide exceptional corrosion protection, water resistance, and surface sealing for marine applications. Formulated using advanced epoxy technology, it creates a durable barrier layer that protects hulls and structures while providing an ideal foundation for finishing systems.

This versatile epoxy undercoat can be used above and below the waterline as part of a complete marine coating system. It functions as a high-build surfacer, final sealing coat, or underwater barrier coat beneath antifouling, helping eliminate imperfections and produce a smooth, professional finish ready for topcoating.

Suitable for both professional and DIY marine painters, the Altex Epoxy Barrier Undercoat delivers excellent sanding properties, long pot life, and dependable performance in harsh marine environments.

Key Features

• High-performance two-pack epoxy barrier undercoat

• Excellent corrosion and water resistance

• High-build coating to smooth and seal surfaces

• Suitable for above and below waterline use

• Ideal as a barrier coat beneath antifouling systems

• Excellent sanding and surfacing properties

• Long pot life and wide recoat window

• Compatible with polyurethane and acrylic finish systems

• Suitable for GRP, epoxy laminated wood, and prepared coatings

Technical Specifications

• Product Type: Two-component epoxy high-build barrier undercoat

• Pack Size: 1.25L kit (Part A + Part B)

• Mix Ratio: 4:1 by volume

• Coverage: Approx. 4.5 m² per litre @ 100µm DFT

• Finish: Low sheen

• Pot Life: Approx. 8 hours @ 25°C

• Application: Brush, roller, or spray

• Colour: Off-white

• Use: Marine barrier coat, surfacer, and undercoat