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