So I've got some rust in my truck that I want to address and there are two areas that I am going to start with. First is the floor panels under the driver and passenger side. The paint is bubbling to varying degrees on both side and medium severity rust has developed. The under side of the floor panels has been bed lined by the PO and they still feel solid. I know the only true fix is cut em out an weld new panels in but they don't seem to be weak enough to justify that yet. How would grinding down to bare metal and then treating with Rust Bullet and then priming/painting work? The other area is the bed. It was lined by the PO and the coating is now peeling and minor surface rust is bubbling up. My plan is to remove the old bed liner, coat with rust bullet then re-apply new liner. I've read removing liner is a serious pain so curious if anyone has tips for that other than heat, chemicals, grinders and elbow grease.