Frame rust, POR15, bellypan repair
I have been putting off repair to the belly pan area right in front of the sheet containing the power cord/sewer hose compartment. Since the smaller sheet was also bent, I drilled out all the rivets, removed and straightened it out. As I was removing the sheet, I noticed that the frame was very pitted and there was much rust scale. It doesn't look like the frame has rusted through anywhere but there was rust scale on the inside of the frame as well as on the outside of the compartment. I chipped away most of the scale after drilling out the other belly pan rivets. The frame crossmember going through the stabilizer jacks seems fine. Some fiberglass insulation was missing and part was compressed by the bent aluminum. I straightened this sheet out as well and will repair a 2" X 4" hole in the very center of the sheet.
I will probably get POR15 but wanted to know if any of the colors were any better than the others, i.e. black vs. silver? Most of the frame will not see daylight but the rear area where the hatch opens up will from time to time. Do I need to topcoat this or not? Also, should I put a bead of Trempro 635 or Sikaflex around the inside where the frame meets the bellypan in this rear compartment or just let her drain?
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system