Frankford Arsenal, Cleancast Lead Flux Fast Drying Provides Quick Lubrication of the Case Body Before Resizing Lead fluxing made easy. No more using rosin, paraffin, tallow, bullet lube and other homemade concoctions. CleanCast is non-smoking, odor-free and it really works. Only a small amount is necessary to prepare a 20lb lead pot for bullet production. Separates dross from your valuable bullet alloy and improves the consistency of the melted lead to eliminate variability during your casting session.