Rusty Door epoxy or something?

Hello,

The best low-budget rust-control method is to:

Wash and dry the area completely

Clean dirt, salt, and road grime off first. Let it dry well.

Scrape or wire-brush loose rust only: Do not dig aggressively if you are worried about opening a hole. Just remove flakes, bubbles, and loose paint. A hand wire brush, scraper, or sandpaper is enough.

Use rust converter: Apply a rust converter product to the remaining rust. These usually turn the rust black and help stabilize it. Follow the drying time exactly.

Seal with epoxy primer: After the converter cures, coat the area with epoxy primer or a rust-sealing primer. Epoxy primer is much better than ordinary spray primer because it seals moisture out better. Let us know if you need anything else.

There's no way a body shop would do this to ensure it is done right? I want to avoid buying stuff I'll only use once. Or my mechanic as the door is a bit more functional than most body areas?

Can you upload an images so I can se the damage?

Just right along the bottom.

Thank you for the image. That rust is deep, which usually means moisture has been trapped behind the paint or inside the lower panel seam. I would get a used door from ebay and replace it. It would cost more to fix then a used door. The rust behind the door will need to be cut out and a new metal piece welded in. Is this the only rust on the car? If so and the car is in good shape other than these places it would be a good idea to have it fixed.

It's a 2008 car. Where could a used door in good shape be found. I don't even know if the car will last 3 more years. Why can't it be patched up? Why can't your previous idea work? I used to get an antirust treatment injected into doors from below. I'm surprised this is where is developed.

Yep, you can get a door from ebay but if you want to patch it then you should be good. I just wanted you to know the permanent way to fix it is replace the door but a patch will work as well.

Yeah. Just stop the rust and protect door inside from weather.

Yep, you can grind it out and use Bondo, then sand and then paint here are links to the products you need.

https://amzn.to/437nxoB

and

https://amzn.to/4dpI0d0

Please let me know what happens.

Thanks. My mechanic recommended a body shop. Hopefully they can do that.

Yep then can, that is what they do, just don't let them talk you into a massive repair.

My mechanic recommended a body shop out of town. They quoted about $700 to cut out rusted area and weld in new metal. That seems a bit pricey but more than that they wanted to hold onto car for 3 whole days which I can't afford to do, particularly since the shop is really out of the way. A little suspicious that he offered to reduce price if I paid cash. I really don't know what to do. I just want the rust to stop. I regret stopping the antirust treatment I was getting when I first got car. I don't feel comfortable doing it myself, at least without supervision.

Yep good call, I would not worry about the reduced price for cash many shops do this, but they will need the time to do the repair because of drying time for their products which is normal.

Is there a spray or clear paint on product that would slow the rusting down without sanding it down?

Yes, you can spray a rust converter or rust encapsulating coating on the area to help slow the rusting process, but it is only a temporary repair if the rust is not sanded or cleaned first. Here is the product you want to use.

https://amzn.to/49h9i4b

Let me know how it goes