Hello all... I'm in the process of replacing my front floor pans on my 67 bird. The back one's are ok, and part the the floor is already painted and has some rubberized spray. I'm looking to paint the entire floor again and protect it from rusting away. I have been told about the POR 15 but there are other coatngs being sold by Eastwood such as out like Rust Converter. Can anyone tell me what is the best to use to paint the surface.. Do I have to grind the old paint off the floor pans to use these products.. I figure someone here has done this before and can give me some guidance. Thanks all.. Help..