Originally Posted by aktrapper
So my GW is pretty rust free and I want to keep it that way for the next 5-10 years until I do a frame-off. What paint can I use on under body parts to help protect them? POR-15 seems like a PITA to do a little at a time since it goes bad after you open the can. Would Rustoleum be the best choice? What else is out there that is durable?
I just want to paint what I am working on at the time like shock mounts or sway bar brackets, not doing the whole frame.
I plan to wire brush, spray
If me I would simply keep the problem areas clean. The front shock towers and inside the front boxed area of the frame are the two biggest problem areas. Some products like POR15 can cause more rust than if left alone if not applied properly; I have seen this happen twice. Also adding sub standard coatings now will make cleaning more difficult later.
The open frame section behind the third crossmember could benefit from protection. For some reason the metal in this area has a tendency to corrode and become thin, particularly from the inside of the channel. Also the interface between the trailer hitch and frame is another area that could benefit from a coating.
I just realized you have a GW. The structure surrounding the fuel tank is another problem area. I would spent the time to drop the tank and clean this area. There is sure to be some buildup of debris there.