Novol N91521 Classic Hybrid Epoxy Primer – Grey, 2.8 Litre (4:1)
The Novol N91521 Classic Hybrid Epoxy is a high-performance, two-component (2K) primer that represents a major evolution in anticorrosive coatings. This 2.8-litre unit utilizes "Hybrid" technology, combining the legendary moisture-sealing properties of a traditional epoxy with the faster drying times and easier sanding characteristics of a modern acrylic filler.
It is the ideal "foundation" for large-scale restorations, providing a non-porous, waterproof barrier that can be sanded much sooner than standard epoxy primers, significantly speeding up the bodywork process without sacrificing rust protection.
Key Features & Benefits
- Hybrid Efficiency: Engineered to dry faster than standard 3:1 epoxy primers, allowing for sanding in as little as 3-5 hours at 20°C (compared to 12–24 hours for traditional epoxy).
- Ultimate Corrosion Barrier: Like all high-grade epoxies, it creates an airtight, waterproof seal over bare metal, making it the best defense against "rust-creep" and oxidation.
- Exceptional Adhesion: Bonds aggressively to a wide range of surfaces, including:
- Bare Steel and Aluminium.
- Galvanized (Zinc-coated) Steel.
- Polyester Putties and GRP (Fiberglass).
- Old, sound paint finishes.
- High Filling Power: Features high-solids (HS) content, allowing it to hide P180-P240 sanding marks and minor surface imperfections in just 2 coats.
- Excellent Insulation: Acts as a chemical "shield," preventing reactions between old sensitive paints and aggressive modern topcoats (prevents "frying" or lifting).
- Easy Sanding: Unlike "tough" traditional epoxies that can be gummy, the Hybrid formula powders off cleanly, making it easy to achieve a perfectly flat surface for paint.
Professional Application Tips
- The 4:1 Ratio: This 2.8L tin is designed to be paired with 700ml of Novol N91522 Hardener, creating a total of 3.5 Litres of ready-to-spray primer.
- Mixing: Use the Novol N39699 (4:1) Measuring Stick. Stir the primer thoroughly before adding the hardener to ensure all anticorrosive pigments are suspended.
- Preparation: Sand the metal with P120-P180. Immediately before spraying, degrease the surface twice with Novol N65503 Silicone Remover to ensure no oils remain.
- Flash-off: Wait 10-15 minutes between coats. The surface should look "matte" before the second coat is applied to prevent solvent entrapment.
- Wet-on-Wet: If you need a smooth sealer coat, thin the mixture by 15-20% with Novol N65521 Epoxy Thinner and use a 1.3mm-1.4mm nozzle.
Why Choose Hybrid Epoxy?
In the past, restorers had to choose between the speed of an acrylic primer or the protection of an epoxy. The Novol N91521 Hybrid removes that compromise. It gives you the "forever" protection of an epoxy base with the "get-it-done" speed of a filler primer, making it the smartest choice for high-quality, efficient restoration work.
