The Aluminum Investment Casting  are then subjected to other treatments, as necessary, which include additional heating, polishing and refinishing. The bulk of the investment can be removed by sandblasting. Gating stubs are ground flush and flashing is removed when needed. Major sections of the aluminum investment cast pieces are welded together and the seams are ground down. Other casting defects are fixed. Finally, investment casting manufacturers sand the part down once again sanded and then texturize and finish it.