Hey guys thought i mite be able to help on this subject.
i do a lot of rust repairs and body mods for guys doing classic cars hot rods
and custom cars.
at the moment i have a mini that been dipped a Volkswagen that been sandblasted
and a Morris minor that i am removing the paint my self
lets start with the Volkswagen. the sandblasting has been that hash that i am now having to build whole
new panels because there nothing left to weld to. not only that its pitted good panels to the point that
they need major work done to them , the guys budget for this reno was $20 000 ( AU ) with the sandblasting
and the work i done he up to $12 000 ( AU ) he now gone to far to give up he is now looking at maybe
$25 000 to $30 000 to get this back on the road.
Now for the mini at a cost of $4000 (AU) for the chemical dip it has clearly come out much better but the liquid chemical gets into every hole and it brings out rust holes were you may not have seen.
like were rust is eating the panel from the inside to out .
This has proven to be a much better option and i have had know problems welding in new panels.
this is a quick and good solution the dipping an E coat took 2 weeks. if you have time restraints and can find someone that can do it for you in the right manner and do not do extra damage. "shop around."
last of all the Morrie if you have the time and would rather spend your money on nice things for your car
i recommend doing it you self i use a product call strip it disc that fit on a angle grinder or a drill you should be able
to get them from a hardware store cost a bout $14.00 (AU) the only thing you just don't work in one spot to long or you will heat the steel up and it will warp. this way you can see all areas that need fixing as you go the can be marked
photographed for latter repair. i did from l/h front door around the back end to r/h front door and it took about 4 hours at a cost of $28.00 and this will give you clean, and undamaged steel to work with.
But i would recommend the you put a layer of etch primer over it a soon as you can.
i hope this helps