Altex Multipurpose Primer Undercoat – 1L Marine Primer & Undercoat

The Altex Multipurpose Primer Undercoat (1L) is a high-performance single-pack marine primer designed to prepare and protect a wide range of surfaces above and below the waterline. Engineered for strong adhesion and durability, this versatile primer/undercoat provides an excellent base for topcoats while protecting steel, wood, GRP, and previously coated surfaces.

Formulated for marine and general applications, it delivers fast drying, smooth sanding, and excellent coverage, making it ideal for hulls, decks, topsides, superstructures, and interior areas. Its surfacing properties help cover minor scratches and imperfections, producing a smooth, professional finish ready for topcoat or antifouling systems.

Suitable for brush, roller, or spray application, this durable primer ensures long-lasting protection and reliable performance in demanding marine environments.

Key Features

• Versatile single-pack primer and undercoat

• Suitable for above and below waterline applications

• Excellent adhesion on steel, wood, GRP, and prepared surfaces

• Fast-drying formula for efficient application

• Easy sanding and smooth surfacing finish

• Covers minor scratches and imperfections

• Suitable for hulls, decks, topsides, superstructure, and interiors

• Brush, roller, or spray application

• Compatible with many marine topcoats and antifouling systems

Technical Specifications

• • Type: Single-pack primer / undercoat

  • Finish: Flat

  • Colour: Off-white

  • Application: Brush, roller, or spray

  • Substrates: Steel, wood, GRP, prepared coatings

  • Use: Above & below waterline

  • Size: 1 Litre