carpet replacement source

Well, I have removed the asphalt mat from my car and man am I glad I did! The whole drivers side of the floor pan is covered in surface rust. Not that it's exciting but I am glad I decided to listen to your advice. would have sucked to cover it all up and end up with my foot going through the floor later! Now, I need to find a good product to remove and seal up my floor pans. Any ideas?