The floorpans inside my car are in good condition, as is the firewall. There is only surface rust on the inside of the firewall and the toeboard portion of the front floorpans. The previous owner had coated areas of the floorpans with a product that looks like paint but seems to be much thicker (black). Does eastwood have a product that is similar? I would like to clean the entire floorpans, treat the surface rust, and coat the entire inner floorpans. What products should I use and what steps should I follow? Some areas are bare metal, some areas are the coating that the previous owner applied, and some areas are factory paint.