The instructions on the Marvelux indicate that it is to be stirred into the alloy with a heated utensil and then skimmed off after the stirring phase is complete. As a side note, you should keep your lead pot full when you are casting, and add more metal as room becomes available. This will help to keep your alloy temperature more constant, which will make your casting and bullet consistency easier to maintain. I add the sprue directly back to the pot after it has been cut, this also helps to maintain alloy temperature. The other benefit of keeping the pot full, is that you don't have to flux as often. If you happen to use a larger pot when processing your alloy, such as wheelweights, you can flux it before you pour your ingots. I like to cast with prepared ingots as it makes the most of your time casting and provides less distraction when you should focus on a established casting routine in order to help make uniform bullets.
It sure is satisfying to have a big pile of new shiny bullets when your done.
It sure is satisfying to have a big pile of new shiny bullets when your done.