Maybe check out this stuff: http://www.rustbullet.com/HowItWorks.htm
Like many things, it claims to be the "best", but I believe in this case they have the research and track record to prove it.
Apparently, you won't need to remove every spot of rust because this stuff will lift it from a metal surface and then encase it in resin, making the rust harmless - unable to do further damage. It doesn't just 'convert' rust to that annoying black powder. And it's paintable. I ordered some but it's too cold to do auto touch-ups right now, so I can't offer a personal testimony.
Anyhow, it has a 2-year shelf life unopened, but only 2-3 weeks once opened, so be sure to order the right quantity!
Like many things, it claims to be the "best", but I believe in this case they have the research and track record to prove it.
Apparently, you won't need to remove every spot of rust because this stuff will lift it from a metal surface and then encase it in resin, making the rust harmless - unable to do further damage. It doesn't just 'convert' rust to that annoying black powder. And it's paintable. I ordered some but it's too cold to do auto touch-ups right now, so I can't offer a personal testimony.
Anyhow, it has a 2-year shelf life unopened, but only 2-3 weeks once opened, so be sure to order the right quantity!