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15 Before welding in the new inner rocker, we cleaned up the ends of the body braces we're keeping (more on that later) some more then coated them with weld-through zinc primer so the rust couldn't return. While you're doing an install like this, if the opportunity comes up to clean up normally inaccessible rusty parts and coat them with some sort of protection, do it. You can use rust neutralizers and encapsulators like Por-15 on certain areas, but if it's an area that will see welding, you must use a weld-through primer. If you're not sure, then use zinc primer to be safe.