TT-P-645B(SH) - Zinc-molybdate primer for steel and aluminum TT-P-645B(SH) is a zinc-molybdate primer. Read the full specification. View prices for direct sales. Intended for use as a corrosion inhibiting primer on metal surfaces, particularly in marine service, including vessels (both interior and exterior), offshore platforms, and coastal structures. Formula 84. Ttp645.com~Site InfoWhoisTrace RouteRBL Check