I knocked out some rust repair on here I've been putting off for a while. I noticed a rust spot develop behind the driver side front fender, low, down at the rocker when I opened the door. It got noticeably worst over the last year and I wanted to cut the cancer out before it really spread. I picked up a weld-in rocker panel from Mill Supply to make life easier. It fit pretty well and I only had to add a small amount of material to the height in the front.
I always say there's a rule of thirds with rust where you can see a third but there is two-thirds hiding. This was definitely true here but there was a bit more hiding. There are about 4-5 layers at this corner. The outer two were rotted through, the third layer was rotted through and missing, but the remaining inner layers were actually clean. It became obvious that the inner layer section was well drained and the outer layer drainage was blocked by the third layer that rotted way.
I cut away the first two outer layers until all of the rot was removed and cut as much of the third layer as I had access to. I was happy to see the remaining inner rockers in good shape with ample drainage and everything I was going to have to weld to cleaned up nice. Next, I cut up a section of the Mill Supply rocker to fit the area that was removed, added a small section to the front and drilled for perimeter plug welds. Then, I POR15'd any exposed metal both on the car and the back of the patch panel that was going to be a half inch away from welding. The areas that were going to be hidden that would see heat got coated with copper weld through primer. After some welding and admittedly a lot of grinding, I POR15'd the outside of the new section, surrounding area and behind the plug welds I had access to.
My plan was to rattle can and color match to the body but I ran out of time. If I didn't have to wait for the POR15 to cure, I would have been able to squeeze that in. Everything below I knocked out in 2 days 1030a-430p at a buddy's shop. I could have went a bit further on the details of blending this in but overall, I'm happy for the 12 hours spent.


95 SLE... a keeper. 241k miles. Low and Slow.
97 BMW 528i
98 Infiniti vq35'd i30: 13.3@104mph, 30MPG Hwy (RIP)
02 Jag X-type
03 BMW M5
05 Chevy Cobalt LS
07 Infiniti G35s 6MT (Sold)
07 Ducati Monster S2R 800 with DS1000 swap
83 Yamaha IT175K
72 Yamaha DS7: '74 RD250 swap, JL chambers
Info on dropping a 92-99:
Here.