You should be able to control that with a bit of the rust conversion stuff Eastwood sells. Then top coat it with por and then paint it. As long as you caught it all you will be ok. Rust is really hard to stop on a yota but in your situation at leat you don't have to worry about the frame. I remember that from your build thread.
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98 3rz 4x4 5spd- Monstalined, 99 Talls, 4.30 E-locker, Extra Lights
In Progress:
Tundra/Rear Disc Brakes w/parking brake
Roof Rack/Rear Ladder
Sliders
1st Gen Rollbar Shelf
How good does the repair need to be? The fender flare covers it right? Could you cut it out, prep, paint and cover?
The problem is, that is interior cab past that hole, while yes I can cut it I still need to get the hole closed up before I paint and put the flare back on.
Avdian (Avy, Avi, Av, Eddie are some nicknames)
Tess - 97' 4Runner "Project Something Or Another" - No More
Annabelle - 00' 4Runner Limited "The Next Chapter"
Natascha - 99' GTI 2.0 N/A Auto - SOLD!!
Swordfish - 05' Camry 2.4 Auto
Project Fluffy - 93' SC400