I'm almost ready to weld in my shock tower reinforcements and I need your advice. I stripped almost the entire shock towers down to bare metal and I have a can of weld through primer for the backsides of the new metal and the areas of the towers that will be welded. My question is this; is it necessary to spray the weld through primer on the areas of the shock towers that will be covered by the new metal, or am I better off using an epoxy primer there and the weld through only where the welds will be made? I want to make sure I have proper rust protection behind the new reinforcements. Thanks in advance.