NEED HELP Rust along bottom of my rear doors


Well-Known Member
My 2003 TB has rust along the inside bottom of both rear doors. I've sanded them, primed and painted them and the rust comes through. Does anyone sell replacement sections for these doors?
I been looking for a clean set of doors for awhile, but I live in the rust area so they aint appeared yet.


Silver Supporter
What kind of primer and paint did you use?
I'm only recommending this as a temporary fix, but you should try Por15 paint:

I've used that Por15 on many different metals over the years and have had very good results with it retaining minor to moderate rust. *Paper thin metal that peels off with slight movement should be replaced. Ain't no paint that'll help that :hopeless:

When painting (if possible), try to coat both inner & outer sides so it completely encapsulates and stops it. Then scuff, clean and apply your basecoat/clearcoat over the por15 paint. That should buy you much more time and keep any remaining rust from pushing through.


Active Member
I have one spot on mine too, on the inside of door . Not all the way through yet. Seems like this is where it starts on these trucks.
Problem is, when you see it, it has been going for a while from the inside already most likely, or at least deeper within that folded seam.

I do not know of any replacement sections for these doors. I looked a while ago and found nothing.


Well-Known Member
It's the only rust I have on my body. Luckily for the last 7 years it hasn't gotten any worse. Not much that can be done...


Well-Known Member
Water gets in the door, if the drains are plugged the water sits a rots the tactic is to spray atf inside the door.
I save all my drained atf, i fill spray bottles with it and keep them handy,..whenever im working on soething that looks dry or corroded,..under carriage,..calipers,..spray away. Atf is a good rust inhibitor,..and drained atf is free.


Silver Supporter
My rear doors also have the cancer and the only fix is "new" doors.
You would think that with this area rusting on so many of our rides that someone would make a replacement section so we can cut the rust out and weld in a new section. I saw a guy somewhere on youtube cut his off and make a new piece that he was able to weld back in after prepping the inside of the door skin. This is where an auto body friend would come in real handy. Used doors are $300 plus and then add shipping too.
I remember when they used to sell complete door skins. I guess the cost of those outweighed the cost of the labour instead.
Maybe if enough of us ask (nicely!), they'll start producing an outer skin?
And it would also seem that they're quick to respond too! Under an hour. :biggrin:

" John,

As a long time GM truck fan and owner, I agree with you. Especially for all the Trailblazer SS type guys that are building these trucks. I will certainly pass this along to my R&D head and maybe that can be something we’ll offer in the future. We are just dipping our toes in with some more parts for 1999-2007 Classic Silverados so who knows?

Thank you

Zach Huckleberry
Auto Metal Direct "