For what areas i could not access (inside rockers and frame rails) I used eastwood rust converter. They have one product with a long hose and a multi directional spray nozzle. Honestly dont know if it works or not, but several years along I dont have rust. Figured something was better than nothing. I have not used por products ( i have used chassis savor, which I believe is a similar product) but my impression is that it should be applied directly to the rust itself for it to work the way its supposed to. I have heard if the surface is somewhat clean it will peel off.
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