The Spray Bike Frame Builder's Smoothing Putty 400ml is a sprayable aerosol filler for levelling surface imperfections on bicycle frames before painting. Even well-prepared frames can have minor scratches, pits, rust spots, or surface irregularities that would show through a colour coat — Smoothing Putty fills and builds up these areas, giving you a smooth, consistent base that makes the finished result look professional rather than patched.

The formula works on steel, aluminium, and carbon frames, and applies easily in light coats over the complex curves and junctions of a bicycle. Once dry, it sands easily to a smooth, even surface ready for priming and painting. Use between the bare frame and your Metal Primer or Carbon Primer stage for a flawless foundation before applying any Spray Bike colour coat from the BLB London, Vintage, Historic, Pop, Nightshade, Fluorescent, or Keirin Flake collections.

Smoothing Putty fills a critical role in the Spray Bike Frame Builder's system — it's the product that separates a truly clean custom build from one that shows its history through the paint. If you're restoring a vintage frame or working with a steel frame that has surface corrosion or old paint damage, Smoothing Putty is the step that makes the difference.

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