Oatey 30013 Paste Flux, 4-Ounce, Yellow Cleans and fluxes at the same time. Effective on all metals except aluminum, magnesium and stainless steel. 100% lead free. Blended to clean surface oxidation. Videos How To Solder Cleans and fluxes at the same time Effective on all metals except aluminum, magnesium and stainless steel 100% lead free Blended to clean surface oxidation