The Spray Bike Frame Builder's Cold Zinc 400ml is a cold galvanising primer aerosol for protecting bare steel bicycle frames against rust and corrosion before painting. If you're working with a bare steel frame — particularly one that will be exposed to wet, humid, or coastal conditions — Cold Zinc is the essential first step before priming and painting with any Spray Bike colour coat.

Cold galvanising works by applying a zinc-rich layer directly to the bare steel surface, creating an electrochemical barrier that actively prevents rust rather than just covering it. Unlike a standard primer that only provides a physical barrier, Cold Zinc gives your frame genuine corrosion resistance from the inside out. Apply in even coats from 20cm or more and allow to fully cure before applying Metal Primer and your chosen colour.

Cold Zinc is the recommended opening stage of the Spray Bike Frame Builder's system on bare steel. The full workflow — Cold Zinc, Metal Primer, Smoothing Putty where needed, colour coat, and Transparent Finish — gives you a frame that's protected at every layer and ready to withstand the demands of regular riding in all conditions.

Browse the complete Spray Bike collection including all Frame Builder's preparation and finishing products at Fat Buddha Store. View all spray paint supplies in our full range.