Zinc Rich Dust Graphite Primer (Mexbond HB4 Z/R) is a high-performance, two-pack coating formulated with zinc-rich synthetic graphite for steel surfaces exposed to extreme heat and limited surface preparation. Ideal for chimneys, mufflers, exhausts, and high-temperature industrial structures, it delivers excellent abrasion resistance after heat curing and long-term corrosion protection.
This matte metallic grey primer is self-priming and suitable for hand or power tool-prepared substrates. It offers a volume solids content of 53±2% and a theoretical coverage of 14.2 m²/Ltr/coat at 40 microns DFT. The product dries to touch in 10–14 hours depending on temperature and cures fully in 7 days at 20°C.
Application methods include brush, roller, conventional spray, and airless spray. It requires GCI Comexs Epoxy Thinner for dilution and cleanup. The pot life is 2 hours, and a 15-minute induction period is required before thinning and application. Shelf life is 12 months.
Surface preparation must ensure a clean, dry, oil-free substrate. The coating should not be applied when humidity exceeds 85% or temperature drops below 5°C. Safety precautions include respiratory protection due to crystalline silica content and proper ventilation during application and sanding.