Graphogen Assembly Compound is a Colloidal Graphite paste in mineral oil and is used during assembly. All internal surfaces of machine parts – especially cylinder walls, pistons, and piston rings, main bearings, valve stems etc – are coated with a liberal layer of Graphogen. The paste is applied with a clean finger or brush, without being diluted. It will not run off treated parts whilst in storage and all internal treated parts are protected right from the start by a Graphogen layer of concentrated colloidal graphite. This will create a lasting skin which is self lubricating and retains the oil under difficult conditions. Sold in 10 gram sachets. (That’s enough for one full Bonneville engine rebuild).