Scraping is done with a long, wood-handled chisel. First, the surface is cleaned, made level, and marked in pencil with a grid pattern. The chisel is held with both hands, with further pressure applied by the shoulder pushing against the wooden handle. As the blade of the chisel digs into the aluminum surface, the chisel is pushed and flicked with a rotating motion. Once this is repeatedly accomplished in one direction, the part is turned 90 degrees and the entire process repeated again. Finally, the part is hand-sanded with a very fine-grade paper to remove the aluminum shards and burrs.