GeorgeKraft wrote:.......I want to remove the paint, but don't want to let it sit and rust without paint.
What rust stop product can I use to treat the car after the paint is off to reveal rust, that can still be welded on? I suppose i can just sand it off if needs be.....
I use a phosphoric acid based rust treatment. Besides dealing with light rust, it will etch the metal and give you some rust protection.
(The one I use is from Laser Chemicals - De-Rust)
Sometimes I may shoot a single pack etch primer if it will stand for long but I still need to work the area, making sure I can get it off afterwards.
I have a number of cars past and present that have been sandblasted and painted with a marine epoxy
On one project it has taken a month and R10K in labour to remove it

The paint stripper that I eventually found is NASTY stuff - get a small splash on you and a blister forms in seconds.......an employees of the paint supply dropped a container and has been in and out of hospital with skin grafts etc...
No idea why this sandblaster and supposedly respected 'restoration specialist' does it this way????
But then I would NEVER sandblast a car at the outset - you will lose a lot of shape information. I prefer to make the repairs to heavily corroded areas (like I see in a lot of your pics) and do any blasting needed later.
For the same reason I NEVER cut out an area before I have the new part made, fitting correctly, and marked out...
Although you
can weld painted metal (especially with Mig) it really isn't a good idea - any impurities will compromise the weldability and more importantly the integrity of the weld. Clean, clean, clean is the first rule of welding anything if you want good results....
BTW are you planning on running a Tig torch on your new inverter?