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Marvelux is the most successful and popular flux for bullets casting. It has been available since 1971 and satisfies the needs of experienced and successful professional and amateur casters. This flux is non-corrosive for both iron and steel and does not produce fumes that can lead to corrosion, unlike Sal-ammoniac (ammonium chloride). Additionally, Marvelux keeps your pot free of rust with regular usage. It significantly reduces dross formation and increases bullet alloy fluidity, making it easier to obtain well-filled-out bullets.

Furthermore, Marvelux is suitable for any lead-based alloy melt designed for casting bullets or swaging cores. It is non-smoking, flameless, and odorless, making it superior to beeswax, tallow, paraffin, and other grease-type fluxes. Additionally, it is better than rosin and eliminates the unpleasant smell of burning old sheds.