Sure Weld is an aid for welding in propane, natural gas, and coal or coke forges. It contains a mix of high-quality elements including borax, steel, oxidization prohibitors, and special bonding components. Optimizes the metal bond by preventing oxidizing & the metals from burning, and with a weld fortifying/ strengthening effect. The strengthening effect is especially pronounced welding low-carbon steels (mild or structural steels, such as A336, and the metals commonly used in decorative blacksmith forging and in making horseshoes.) A very efficient Flux - only a small amount is needed. Size Available: 16 oz Tin with twist cap (instructions for best use are included on the label). Note: When sold out, an alternate product is Iron Mountain Flux - BLACK - for general forge welding. For Damascus consider Iron Mountain Flux - WHITE - to minimize iron inclusions. Brazing? Iron Mountain Flux - RED contains more copper and melts with less heat, and is popular for torch brazing, and hard-surfacing.