Welder, educator, author, and consultant Mark Prosser joins the podcast again to pass on more of his welding skills, knowledge, and tips with listeners. Speaking on the issue of welding on older muscle cars, Willie notes that,” when you get into that old metal, it takes the weld so much differently from some of the new metal … what's so different about metal today that's different from metal from several decades ago?" "Metals change through the years” Mark notes speaking on metallurgy,” just like welding processes, just like everything else". On this podcast, Mark and the guys shine a light on some of those changes and offer some techniques that might just help you tackle some of those welding issues, especially those that occur when working with thin sheet metal.