Inorganic Zinc Silicate Primer (Comobel PR 402) is a high-performance, solvent-based coating designed to provide superior corrosion protection for steel surfaces. Formulated with metallic zinc held in a glassy silicate matrix, it delivers effective cathodic protection and long-term durability in aggressive environments.
Recommended for use on sandblasted steel (SA 2.5 / SSPC-SP10) and as a tie coat over gel coat or raw resin lay-ups, this matte grey or green primer is ideal for marine structures, offshore platforms, industrial tanks, and high-strength bolted connections. It can also be used before fairing applications.
The product features a volume solids content of 48±2%, a theoretical coverage of 6.5 m²/Ltr/coat at 75 microns DFT, and a pot life of 6 hours. Drying times vary by temperature: 4 hours at 10°C, 3 hours at 20°C, and 1 hour at 40°C. Full cure is achieved in 4 days at 20°C, with a recoat window of 12 hours to 5 days.
Application methods include brush, roller, conventional spray, and airless spray. A 15-minute induction period is required before thinning and application. Use COMOBEL 999 Epoxy Thinner for dilution and cleanup. Shelf life is 6 months.
Safety precautions include respiratory protection due to crystalline silica content, and proper ventilation during application and sanding. The product should not be applied when humidity exceeds 85% or temperature drops below 5°C.