The Spray Bike Frame Builder's Metal Primer 400ml in Light Grey is a purpose-built aerosol primer for bare steel and aluminium bicycle frames. Before applying any Spray Bike colour coat, a proper primer foundation is essential — Metal Primer creates the adhesion layer that ensures your top coat bonds correctly to bare metal, delivering a more durable and even finish than painting directly onto an unprimed surface.

The low-pressure, non-drip formula makes it easy to apply over the complex geometry of a bicycle frame — around joints, inside forks, and along tight tube sections — without runs or sags. Spray from 20cm or more for even, consistent coverage. No acid washing or heat treatment required. The light grey tone works across the full spectrum of Spray Bike colour coats, from light pastels to deep darks.

Frame Builder's Metal Primer is the recommended first step for any bare steel or aluminium build or restoration in the Spray Bike Frame Builder's system. Follow primer with any colour coat from the BLB London, Vintage, Historic, Pop, Nightshade, Fluorescent, or Keirin Flake collections, then seal with Frame Builder's Transparent Finish for a fully protected frame.

For rust protection on bare steel frames in humid or wet environments, apply Spray Bike Frame Builder's Cold Zinc before the Metal Primer for maximum corrosion resistance. Browse the complete Spray Bike collection and all spray paint supplies at Fat Buddha Store.