Dealing with a bit of rust

[Crazyced]

I have worked on the 240sx a little bit lately. I'm nearly don removing the tar mats with only the wheel wells left to do.
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_174106_zpspeckpvno.jpg

I have however found a bid of rust that I will hopefully be able to deal with. I got a rusted hole were a drain plug used to be (this was under the tar mat).
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_175755_zpsgkochgkf.jpg

I also have some rust at the front bottom of the driver's side wheel well.
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_175812_zpstagjvtmy.jpg
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_175902_zpsdhw7uwys.jpg
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_175920_zpsnebfkeaj.jpg
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_175926_zpsvwgb6lf0.jpg

I also have a couple of small holes at the drivers side trunk floor
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_175822_zpsdpqybkuk.jpg

The passengers side wheel well has rusted though at the trunk seem as well.
http://img.photobucket.com/albums/v736/Crazyced/240sx/20151111_175836_zpseet4bpsy.jpg

I noticed that a lot of the rust appear at the seems, behind the seam sealer the factory puts on. Do you guys have any tip on how to remove that sealer and get a better picture of what needs to be fixed? Any advice?

This car will be track only ad hopefully never see rain again but I'd like to fix what's there.

[MJH240SX]

On the areas that were just surface rust, I just wire-wheeled the area to bare metal, used rust treatment and painted it. I also had a rusted out drain plug. I cut it out and welded a small plate in, treated it and painted. The areas that were on the seams were luckily just surface rust, so i wire wheeled them to bare metal, added a couple tack welds, then treated and painted. Luckily none of the seam spots were rusted through.

Not sure if it was the correct way, but that's what I did.

[rawgarage]

Repairs sound good. so many of these poorly treated over the years...

[Crazyced]

Yeah. Canadian winters and road salt are not very kind to 30 year old chassis.

My seems are rusted through so some plates will be required. I have a MIG but never used it. I will also need smaller gauge wire for it.

[Crazyced]

I'm reading this thread from fellow Canadian for inspiration but good god I don't want to have to be as thorough as he was.

http://forum.eastwood.com/showthread.php?8481-My-95-240SX-restoration-project