Originally Posted by LesMyer

I like the Krown Rustproofing Spray. They give me a 16 oz aerosol can when I bring each vehicle for my yearly rustproofing and I use it for touch ups in bad areas. I have had them do both of my 4WD vehicles the last two years. I think you can buy the 16oz spray cans and larger quantities from them. The Canadians seem to really know how to rustproof. It's oil based so need reapplied periodically. I'm sure it's specially formulated to prevent rust as much as possible (just like the RIG gun grease I used on my front ABS sensors 5 years ago). The problem with the sound deadener applications like Ziebart is that the nasty road salt can get underneath or around it and just sit there and rot things out.
https://www.krown.com/en/
https://shop.krown.com/collections/k...rust-inhibitor