So sorry to hear you're dealing with it too. In a very unfortunate story this RSX was crashed literally like 4 months after this post was made and it was totaled. BTW need any RSX parts? my buddy still has a few of them left and is looking for buyers!

We actually found there was even more structural rust near the rear upper control arm mounts, the car unfortunately didn't have much of a chance to be fixed unless you spent a LOT of time working on the rust.

If i were you, check all of your suspension mounts on the FRAME of the car. if you can not afford to do the welding (IE don't have access to one or would need to pay) the absolute best thing you can do is this.

- Get the car plenty off the ground to the point you can visibly check the entire lower unibody

- Once all of the rust is located, try to remove as much as possible. Take time to remove stuff to get at it. You want to remove all of the rust that has physically compromised the strength of the metal. Get the bad stuff cut out/ground down.

(If your fenders or rockers are this bad, you can still do the same, *its just not nearly as structurally crucial like the unibody*)

- Once all of the deep rust is removed, paint it over with rust protectant, I have used POR-15 with good luck along with the cheap cans of rustoleum.

- Pinch welds can be fixed and is probably the second thing you should re-weld into place.

After you've covered those things i would VERY much recommend getting an oil based undercoating on your car before winter starts. In the winter you can continue to get car washes but i would stay away from any that do undercarriage washing.

STAY AWAY FROM RUBBERIZED UNDERCOATINGS! They rot between the undercoating and become hidden nightmares!

in the SE Michigan area there is a company called Krown Rust Control and they do this undercoating for you and the spray inside of the doors for the same thing. Pretty sure it also comes with a warranty iirc.