Interlux Paint Primers & Undercoaters

Interlux Paint Primers & Undercoaters: The Foundation of a Professional Marine Finish

Every great marine paint job starts well before the topcoat goes on. Interlux Paint, one of the marine industry's most trusted names, brings the same engineering rigor it applies to its finish coatings to its full line of primers and undercoaters — delivering products that professional boatyards and weekend boaters alike have relied on for generations.

Why the primer layer matters so much: On a boat, adhesion failure isn't just an aesthetic problem — it can expose bare metal or fiberglass to salt water, accelerating corrosion and osmotic blistering. Interlux designs its primers specifically for the demands of the marine environment, where substrates range from sanded fiberglass and bare steel to aluminum running gear and previously painted hulls. Choosing the right primer for the right surface is central to the brand's philosophy, and its product lineup reflects that depth of purpose.

Key Interlux Primer & Undercoater Product Lines

• Primocon Underwater Primer — Perhaps the most recognized name in Interlux's primer lineup, Primocon is an anti-corrosive primer engineered specifically for underwater metal surfaces, including hulls, running gear, and the lower units of outboards and I/Os. It provides an excellent barrier to reduce pitting caused by galvanic corrosion and also serves as a conversion coating over unknown antifouling paint, helping prevent cracking of new topcoats.
• InterPrime — A versatile undercoater designed to prepare a wide range of bare surfaces above or below the waterline for topcoat application, ensuring strong intercoat adhesion throughout the paint system.
• PreKote — A single-part primer that prepares surfaces for topcoat finishes, promoting maximum adhesion and a long-lasting bond between substrate and finish coat. PreKote simplifies the surface-preparation process without sacrificing performance.
• PrimeKote — Positioned as a high-performance undercoater, PrimeKote serves as the base layer for finish topcoats, contributing to a smoother, more durable final appearance.
• Interprotect (Barrier Coat) — A high-solids, two-part epoxy that functions both as a primer and a barrier coat, usable above and below the waterline. It provides strong defense against water absorption and corrosion, and meets stringent VOC regulations.

What Sets Interlux Primers Apart

Interlux has been formulating marine coatings since 1881 and is today a division of AkzoNobel, one of the world's largest paint and coatings conglomerates. That heritage means Interlux primers are developed in dedicated marine labs, tested against real-world conditions on the water, and engineered to work as a complete system with Interlux topcoats and antifouling paints. The result is predictable adhesion, compatibility, and protection — whether you're painting a fiberglass sailboat hull or treating the aluminum outdrives of a center console.

Interlux primers are available in both one-part and two-part formulations, in quart and gallon sizes, and in aerosol format — giving boaters the flexibility to match product to project scale. Coverage, surface compatibility, and below-waterline safety vary by product, so it's worth reviewing Interlux's system-based approach to layering primers, barrier coats, and topcoats for your specific substrate and application.

Whether you're starting fresh on a new fiberglass hull or rehabilitating bare metal underwater gear, Interlux's lineup of primers and undercoaters provides a purpose-engineered starting point that makes every finish coat perform better and last longer.