We removed the old carpet to clean the floor of any surface rust and to seal it with good anti-rust primer, as well as to install new carpet. The floor was in great shape, as is most of the tar/asphalt/whatever-it-is underlayment. But some of that underlayment was crumbled falling apart. I bought top-of-the-line carpet from ACC with the jute padding attached. But I would like to replace the missing sections of the underlayment without buying an entire kit I don't need for $75. The driver's side floor was, of course, the place that wore the most and now that we have installed headers, it will also be a lot hotter with no underlayment. What else that I can buy locally that will work for replacing that stuff?