That test was very intresting. But to the extreme a hit that hard on your truck and your going to be doing body work anyway. It stands to resune that the less different products on there, the less that can go wrong. I like the epoxy primer where I've done rust repair. It helps seal it up. If you leave a little pin hole in a weld and water can get in behind the mud it will rust back out fast. we've all seen those little bubbles come up in a fairly new paint job. I like to use a product called all metal as a fist coat (front and back side) any where that Ive welded. It don't soak up water like bondo does.
