Alumaloy is a fluxless aluminum repair rod and is very user friendly. Alumaloy will solidify stronger than the aluminum you are repairing. Always keep flame in motion and use a neutral flame. IMPORTANT: make sure to thoroughly clean the aluminum area you are repairing with a fine wire brush. Also be sure to wear proper safety gear such as gloves and eye protection when working. Never wear loose clothing or work around flammable substances. Safety is the Key!! NEW! We have just added an Alumaloy Community Forum! Come chat with other Alumaloy users! NEW! We have just added a Castaloy Community Forum! Come chat with other Castaloy users!