I have a question about the EDP finish on AMD panels when it comes to spot-welding. I am getting ready to install the outer wheelhouse, trunk drop off, and quarter panel to my 72 Camaro. This is my first job of this size, and I want to do it right. The question I have is do I need to remove the EDP finish on the new panels where I plan to drill out holes for the spot welds, or can I leave the finish on? The finish is EDP (Electro Deposit Coating) coated for corrosion protection.