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Since 1971, MARVELUX has been the most popular and successful bullet casting flux. It serves the needs of both professional and hobbyist casters. MARVELUX is non-corrosive to iron and steel and does not cause fumes like sal-ammoniac (ammonium chloride) that can lead to corrosion. With regular use, MARVELUX keeps your pot free of rust and significantly reduces dross formation while increasing bullet alloy fluidity for better-filled bullets. Additionally, MARVELUX suits any lead alloy melt intended for casting bullets or swaging cores and is non-smoking, flameless, non-smelling. It is superior to beeswax, tallow, paraffin, and other grease-type fluxes. Even better than rosin, it doesn't smell like you're burning an old shed.