[TheEdgeofSanity]

taken from murray's auto parts website:

"Chemical rust converters, such as Extend, from Loctite, transforms red, flaky rust to a hard, dark-grey compound that prevents further rusting and forms a stable base for paint. To use a chemical rust remover, scrape and wire brush away as much of the flaky rust as possible. Remove oil or grease with a solvent such as lacquer thinner, then wet the area with rust remover, keeping it wet for about 2 hours, then hose away the residue. For stubborn rust, you might need to cover the area overnight with rags soaked in rust remover. Next, brush on a coat of converter following the instructions on the label. Once it's dry, the area is ready for painting."